* [syzbot] [sound?] BUG: sleeping function called from invalid context in vfree
@ 2024-11-25 12:54 syzbot
2024-11-25 12:58 ` Eric Dumazet
0 siblings, 1 reply; 5+ messages in thread
From: syzbot @ 2024-11-25 12:54 UTC (permalink / raw)
To: linux-kernel, linux-sound, perex, syzkaller-bugs, tiwai
Hello,
syzbot found the following issue on:
HEAD commit: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=154bc778580000
kernel config: https://syzkaller.appspot.com/x/.config?x=47cc5fc1922531f
dashboard link: https://syzkaller.appspot.com/bug?extid=351f8764833934c68836
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9f16d5e6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dddd5525a287/vmlinux-9f16d5e6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7c9e082ba50b/bzImage-9f16d5e6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+351f8764833934c68836@syzkaller.appspotmail.com
BUG: sleeping function called from invalid context at mm/vmalloc.c:3359
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 6938, name: syz.1.230
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
2 locks held by syz.1.230/6938:
#0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
#0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: snd_rawmidi_output_params+0x51/0x1c0 sound/core/rawmidi.c:748
#1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
#1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: class_spinlock_irq_constructor include/linux/spinlock.h:565 [inline]
#1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: resize_runtime_buffer+0x243/0x530 sound/core/rawmidi.c:727
irq event stamp: 1218
hardirqs last enabled at (1217): [<ffffffff8b189e32>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last enabled at (1217): [<ffffffff8b189e32>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
hardirqs last disabled at (1218): [<ffffffff8b189ad5>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
hardirqs last disabled at (1218): [<ffffffff8b189ad5>] _raw_spin_lock_irq+0x45/0x50 kernel/locking/spinlock.c:170
softirqs last enabled at (0): [<ffffffff814e57ac>] copy_process+0x1e9c/0x6f20 kernel/fork.c:2321
softirqs last disabled at (0): [<0000000000000000>] 0x0
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 UID: 0 PID: 6938 Comm: syz.1.230 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
__might_resched+0x3c0/0x5e0 kernel/sched/core.c:8758
vfree+0x75/0x890 mm/vmalloc.c:3359
kvfree+0x33/0x50 mm/util.c:699
resize_runtime_buffer+0x3a7/0x530 sound/core/rawmidi.c:736
snd_rawmidi_output_params+0xeb/0x1c0 sound/core/rawmidi.c:751
snd_rawmidi_ioctl_params_compat sound/core/rawmidi_compat.c:37 [inline]
snd_rawmidi_ioctl_compat+0x3ac/0x3e0 sound/core/rawmidi_compat.c:120
__do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f01579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f506555c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00000000c0205710
RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot will keep track of this issue. See:
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If the report is already addressed, let syzbot know by replying with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [sound?] BUG: sleeping function called from invalid context in vfree
2024-11-25 12:54 [syzbot] [sound?] BUG: sleeping function called from invalid context in vfree syzbot
@ 2024-11-25 12:58 ` Eric Dumazet
2024-11-25 13:34 ` Takashi Iwai
0 siblings, 1 reply; 5+ messages in thread
From: Eric Dumazet @ 2024-11-25 12:58 UTC (permalink / raw)
To: syzbot, linux-kernel, linux-sound, perex, syzkaller-bugs, tiwai
On 11/25/24 1:54 PM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=154bc778580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=47cc5fc1922531f
> dashboard link: https://syzkaller.appspot.com/bug?extid=351f8764833934c68836
> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: i386
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9f16d5e6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/dddd5525a287/vmlinux-9f16d5e6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/7c9e082ba50b/bzImage-9f16d5e6.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+351f8764833934c68836@syzkaller.appspotmail.com
>
> BUG: sleeping function called from invalid context at mm/vmalloc.c:3359
> in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 6938, name: syz.1.230
> preempt_count: 1, expected: 0
> RCU nest depth: 0, expected: 0
> 2 locks held by syz.1.230/6938:
> #0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
> #0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: snd_rawmidi_output_params+0x51/0x1c0 sound/core/rawmidi.c:748
> #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
> #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: class_spinlock_irq_constructor include/linux/spinlock.h:565 [inline]
> #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: resize_runtime_buffer+0x243/0x530 sound/core/rawmidi.c:727
> irq event stamp: 1218
> hardirqs last enabled at (1217): [<ffffffff8b189e32>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
> hardirqs last enabled at (1217): [<ffffffff8b189e32>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
> hardirqs last disabled at (1218): [<ffffffff8b189ad5>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
> hardirqs last disabled at (1218): [<ffffffff8b189ad5>] _raw_spin_lock_irq+0x45/0x50 kernel/locking/spinlock.c:170
> softirqs last enabled at (0): [<ffffffff814e57ac>] copy_process+0x1e9c/0x6f20 kernel/fork.c:2321
> softirqs last disabled at (0): [<0000000000000000>] 0x0
> Preemption disabled at:
> [<0000000000000000>] 0x0
> CPU: 1 UID: 0 PID: 6938 Comm: syz.1.230 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:94 [inline]
> dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
> __might_resched+0x3c0/0x5e0 kernel/sched/core.c:8758
> vfree+0x75/0x890 mm/vmalloc.c:3359
> kvfree+0x33/0x50 mm/util.c:699
> resize_runtime_buffer+0x3a7/0x530 sound/core/rawmidi.c:736
> snd_rawmidi_output_params+0xeb/0x1c0 sound/core/rawmidi.c:751
> snd_rawmidi_ioctl_params_compat sound/core/rawmidi_compat.c:37 [inline]
> snd_rawmidi_ioctl_compat+0x3ac/0x3e0 sound/core/rawmidi_compat.c:120
> __do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004
> do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
> __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
> do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
> RIP: 0023:0xf7f01579
> Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
> RSP: 002b:00000000f506555c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
> RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00000000c0205710
> RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> </TASK>
> ----------------
> Code disassembly (best guess), 2 bytes skipped:
> 0: 10 06 adc %al,(%rsi)
> 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
> 6: 10 07 adc %al,(%rdi)
> 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
> c: 10 08 adc %cl,(%rax)
> e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
> 1e: 00 51 52 add %dl,0x52(%rcx)
> 21: 55 push %rbp
> 22: 89 e5 mov %esp,%ebp
> 24: 0f 34 sysenter
> 26: cd 80 int $0x80
> * 28: 5d pop %rbp <-- trapping instruction
> 29: 5a pop %rdx
> 2a: 59 pop %rcx
> 2b: c3 ret
> 2c: 90 nop
> 2d: 90 nop
> 2e: 90 nop
> 2f: 90 nop
> 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
> 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
Bug added in
commit 84bb065b316e8367e14a8824a8f4d21056b10c53
Author: Takashi Iwai <tiwai@suse.de>
Date: Tue Feb 27 09:52:51 2024 +0100
ALSA: rawmidi: Use guard() for locking
We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
There are a few remaining explicit mutex and spinlock calls, and those
are the places where the temporary unlock/relocking happens -- which
guard() doens't cover well yet.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link:https://lore.kernel.org/r/20240227085306.9764-10-tiwai@suse.de
<https://lore.kernel.org/r/20240227085306.9764-10-tiwai@suse.de>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [sound?] BUG: sleeping function called from invalid context in vfree
2024-11-25 12:58 ` Eric Dumazet
@ 2024-11-25 13:34 ` Takashi Iwai
2024-11-25 14:07 ` Eric Dumazet
0 siblings, 1 reply; 5+ messages in thread
From: Takashi Iwai @ 2024-11-25 13:34 UTC (permalink / raw)
To: Eric Dumazet
Cc: syzbot, linux-kernel, linux-sound, perex, syzkaller-bugs, tiwai
On Mon, 25 Nov 2024 13:58:09 +0100,
Eric Dumazet wrote:
>
>
> On 11/25/24 1:54 PM, syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=154bc778580000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=47cc5fc1922531f
> > dashboard link: https://syzkaller.appspot.com/bug?extid=351f8764833934c68836
> > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> > userspace arch: i386
> >
> > Unfortunately, I don't have any reproducer for this issue yet.
> >
> > Downloadable assets:
> > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9f16d5e6.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/dddd5525a287/vmlinux-9f16d5e6.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/7c9e082ba50b/bzImage-9f16d5e6.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+351f8764833934c68836@syzkaller.appspotmail.com
> >
> > BUG: sleeping function called from invalid context at mm/vmalloc.c:3359
> > in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 6938, name: syz.1.230
> > preempt_count: 1, expected: 0
> > RCU nest depth: 0, expected: 0
> > 2 locks held by syz.1.230/6938:
> > #0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
> > #0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: snd_rawmidi_output_params+0x51/0x1c0 sound/core/rawmidi.c:748
> > #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
> > #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: class_spinlock_irq_constructor include/linux/spinlock.h:565 [inline]
> > #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: resize_runtime_buffer+0x243/0x530 sound/core/rawmidi.c:727
> > irq event stamp: 1218
> > hardirqs last enabled at (1217): [<ffffffff8b189e32>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
> > hardirqs last enabled at (1217): [<ffffffff8b189e32>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
> > hardirqs last disabled at (1218): [<ffffffff8b189ad5>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
> > hardirqs last disabled at (1218): [<ffffffff8b189ad5>] _raw_spin_lock_irq+0x45/0x50 kernel/locking/spinlock.c:170
> > softirqs last enabled at (0): [<ffffffff814e57ac>] copy_process+0x1e9c/0x6f20 kernel/fork.c:2321
> > softirqs last disabled at (0): [<0000000000000000>] 0x0
> > Preemption disabled at:
> > [<0000000000000000>] 0x0
> > CPU: 1 UID: 0 PID: 6938 Comm: syz.1.230 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
> > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> > Call Trace:
> > <TASK>
> > __dump_stack lib/dump_stack.c:94 [inline]
> > dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
> > __might_resched+0x3c0/0x5e0 kernel/sched/core.c:8758
> > vfree+0x75/0x890 mm/vmalloc.c:3359
> > kvfree+0x33/0x50 mm/util.c:699
> > resize_runtime_buffer+0x3a7/0x530 sound/core/rawmidi.c:736
> > snd_rawmidi_output_params+0xeb/0x1c0 sound/core/rawmidi.c:751
> > snd_rawmidi_ioctl_params_compat sound/core/rawmidi_compat.c:37 [inline]
> > snd_rawmidi_ioctl_compat+0x3ac/0x3e0 sound/core/rawmidi_compat.c:120
> > __do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004
> > do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
> > __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
> > do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
> > entry_SYSENTER_compat_after_hwframe+0x84/0x8e
> > RIP: 0023:0xf7f01579
> > Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
> > RSP: 002b:00000000f506555c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
> > RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00000000c0205710
> > RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000000
> > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
> > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> > </TASK>
> > ----------------
> > Code disassembly (best guess), 2 bytes skipped:
> > 0: 10 06 adc %al,(%rsi)
> > 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
> > 6: 10 07 adc %al,(%rdi)
> > 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
> > c: 10 08 adc %cl,(%rax)
> > e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
> > 1e: 00 51 52 add %dl,0x52(%rcx)
> > 21: 55 push %rbp
> > 22: 89 e5 mov %esp,%ebp
> > 24: 0f 34 sysenter
> > 26: cd 80 int $0x80
> > * 28: 5d pop %rbp <-- trapping instruction
> > 29: 5a pop %rdx
> > 2a: 59 pop %rcx
> > 2b: c3 ret
> > 2c: 90 nop
> > 2d: 90 nop
> > 2e: 90 nop
> > 2f: 90 nop
> > 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
> > 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
> >
> >
> > ---
> > This report is generated by a bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for more information about syzbot.
> > syzbot engineers can be reached at syzkaller@googlegroups.com.
> >
> > syzbot will keep track of this issue. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >
> > If the report is already addressed, let syzbot know by replying with:
> > #syz fix: exact-commit-title
> >
> > If you want to overwrite report's subsystems, reply with:
> > #syz set subsystems: new-subsystem
> > (See the list of subsystem names on the web dashboard)
> >
> > If the report is a duplicate of another one, reply with:
> > #syz dup: exact-subject-of-another-report
> >
> > If you want to undo deduplication, reply with:
> > #syz undup
>
>
> Bug added in
>
> commit 84bb065b316e8367e14a8824a8f4d21056b10c53
> Author: Takashi Iwai <tiwai@suse.de>
> Date: Tue Feb 27 09:52:51 2024 +0100
>
> ALSA: rawmidi: Use guard() for locking
>
> We can simplify the code gracefully with new guard() macro and co for
> automatic cleanup of locks.
>
> There are a few remaining explicit mutex and spinlock calls, and those
> are the places where the temporary unlock/relocking happens -- which
> guard() doens't cover well yet.
>
> Only the code refactoring, and no functional changes.
>
> Signed-off-by: Takashi Iwai <tiwai@suse.de>
> Link:https://lore.kernel.org/r/20240227085306.9764-10-tiwai@suse.de
> <https://lore.kernel.org/r/20240227085306.9764-10-tiwai@suse.de>
Hmm, through a quick glance, I don't see anything breaking there.
Could you tell me which code path introduced the spinlock held during
kvzalloc() call in resize_runtime_buffer() in sound/core/rawmidi.c by
this commit...?
thanks,
Takashi
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [sound?] BUG: sleeping function called from invalid context in vfree
2024-11-25 13:34 ` Takashi Iwai
@ 2024-11-25 14:07 ` Eric Dumazet
2024-11-25 14:13 ` Takashi Iwai
0 siblings, 1 reply; 5+ messages in thread
From: Eric Dumazet @ 2024-11-25 14:07 UTC (permalink / raw)
To: Takashi Iwai
Cc: syzbot, linux-kernel, linux-sound, perex, syzkaller-bugs, tiwai
On 11/25/24 2:34 PM, Takashi Iwai wrote:
> On Mon, 25 Nov 2024 13:58:09 +0100,
> Eric Dumazet wrote:
>>
>> On 11/25/24 1:54 PM, syzbot wrote:
>>> Hello,
>>>
>>> syzbot found the following issue on:
>>>
>>> HEAD commit: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
>>> git tree: upstream
>>> console output: https://syzkaller.appspot.com/x/log.txt?x=154bc778580000
>>> kernel config: https://syzkaller.appspot.com/x/.config?x=47cc5fc1922531f
>>> dashboard link: https://syzkaller.appspot.com/bug?extid=351f8764833934c68836
>>> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
>>> userspace arch: i386
>>>
>>> Unfortunately, I don't have any reproducer for this issue yet.
>>>
>>> Downloadable assets:
>>> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9f16d5e6.raw.xz
>>> vmlinux: https://storage.googleapis.com/syzbot-assets/dddd5525a287/vmlinux-9f16d5e6.xz
>>> kernel image: https://storage.googleapis.com/syzbot-assets/7c9e082ba50b/bzImage-9f16d5e6.xz
>>>
>>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>>> Reported-by: syzbot+351f8764833934c68836@syzkaller.appspotmail.com
>>>
>>> BUG: sleeping function called from invalid context at mm/vmalloc.c:3359
>>> in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 6938, name: syz.1.230
>>> preempt_count: 1, expected: 0
>>> RCU nest depth: 0, expected: 0
>>> 2 locks held by syz.1.230/6938:
>>> #0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
>>> #0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: snd_rawmidi_output_params+0x51/0x1c0 sound/core/rawmidi.c:748
>>> #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
>>> #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: class_spinlock_irq_constructor include/linux/spinlock.h:565 [inline]
>>> #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: resize_runtime_buffer+0x243/0x530 sound/core/rawmidi.c:727
>>> irq event stamp: 1218
>>> hardirqs last enabled at (1217): [<ffffffff8b189e32>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
>>> hardirqs last enabled at (1217): [<ffffffff8b189e32>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
>>> hardirqs last disabled at (1218): [<ffffffff8b189ad5>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
>>> hardirqs last disabled at (1218): [<ffffffff8b189ad5>] _raw_spin_lock_irq+0x45/0x50 kernel/locking/spinlock.c:170
>>> softirqs last enabled at (0): [<ffffffff814e57ac>] copy_process+0x1e9c/0x6f20 kernel/fork.c:2321
>>> softirqs last disabled at (0): [<0000000000000000>] 0x0
>>> Preemption disabled at:
>>> [<0000000000000000>] 0x0
>>> CPU: 1 UID: 0 PID: 6938 Comm: syz.1.230 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
>>> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
>>> Call Trace:
>>> <TASK>
>>> __dump_stack lib/dump_stack.c:94 [inline]
>>> dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
>>> __might_resched+0x3c0/0x5e0 kernel/sched/core.c:8758
>>> vfree+0x75/0x890 mm/vmalloc.c:3359
>>> kvfree+0x33/0x50 mm/util.c:699
>>> resize_runtime_buffer+0x3a7/0x530 sound/core/rawmidi.c:736
>>> snd_rawmidi_output_params+0xeb/0x1c0 sound/core/rawmidi.c:751
>>> snd_rawmidi_ioctl_params_compat sound/core/rawmidi_compat.c:37 [inline]
>>> snd_rawmidi_ioctl_compat+0x3ac/0x3e0 sound/core/rawmidi_compat.c:120
>>> __do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004
>>> do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
>>> __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
>>> do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
>>> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>>> RIP: 0023:0xf7f01579
>>> Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
>>> RSP: 002b:00000000f506555c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
>>> RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00000000c0205710
>>> RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000000
>>> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
>>> R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
>>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>>> </TASK>
>>> ----------------
>>> Code disassembly (best guess), 2 bytes skipped:
>>> 0: 10 06 adc %al,(%rsi)
>>> 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
>>> 6: 10 07 adc %al,(%rdi)
>>> 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
>>> c: 10 08 adc %cl,(%rax)
>>> e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
>>> 1e: 00 51 52 add %dl,0x52(%rcx)
>>> 21: 55 push %rbp
>>> 22: 89 e5 mov %esp,%ebp
>>> 24: 0f 34 sysenter
>>> 26: cd 80 int $0x80
>>> * 28: 5d pop %rbp <-- trapping instruction
>>> 29: 5a pop %rdx
>>> 2a: 59 pop %rcx
>>> 2b: c3 ret
>>> 2c: 90 nop
>>> 2d: 90 nop
>>> 2e: 90 nop
>>> 2f: 90 nop
>>> 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
>>> 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
>>>
>>>
>>> ---
>>> This report is generated by a bot. It may contain errors.
>>> See https://goo.gl/tpsmEJ for more information about syzbot.
>>> syzbot engineers can be reached at syzkaller@googlegroups.com.
>>>
>>> syzbot will keep track of this issue. See:
>>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>>>
>>> If the report is already addressed, let syzbot know by replying with:
>>> #syz fix: exact-commit-title
>>>
>>> If you want to overwrite report's subsystems, reply with:
>>> #syz set subsystems: new-subsystem
>>> (See the list of subsystem names on the web dashboard)
>>>
>>> If the report is a duplicate of another one, reply with:
>>> #syz dup: exact-subject-of-another-report
>>>
>>> If you want to undo deduplication, reply with:
>>> #syz undup
>>
>> Bug added in
>>
>> commit 84bb065b316e8367e14a8824a8f4d21056b10c53
>> Author: Takashi Iwai <tiwai@suse.de>
>> Date: Tue Feb 27 09:52:51 2024 +0100
>>
>> ALSA: rawmidi: Use guard() for locking
>>
>> We can simplify the code gracefully with new guard() macro and co for
>> automatic cleanup of locks.
>>
>> There are a few remaining explicit mutex and spinlock calls, and those
>> are the places where the temporary unlock/relocking happens -- which
>> guard() doens't cover well yet.
>>
>> Only the code refactoring, and no functional changes.
>>
>> Signed-off-by: Takashi Iwai <tiwai@suse.de>
>> Link:https://lore.kernel.org/r/20240227085306.9764-10-tiwai@suse.de
>> <https://lore.kernel.org/r/20240227085306.9764-10-tiwai@suse.de>
> Hmm, through a quick glance, I don't see anything breaking there.
>
> Could you tell me which code path introduced the spinlock held during
> kvzalloc() call in resize_runtime_buffer() in sound/core/rawmidi.c by
> this commit...?
@@ -744,9 +724,8 @@ static int resize_runtime_buffer(struct
snd_rawmidi_substream *substream,
newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
if (!newbuf)
return -ENOMEM;
- spin_lock_irq(&substream->lock);
+ guard(spinlock_irq)(&substream->lock);
if (runtime->buffer_ref) {
- spin_unlock_irq(&substream->lock);
kvfree(newbuf);
return -EBUSY;
}
@@ -754,7 +733,6 @@ static int resize_runtime_buffer(struct
snd_rawmidi_substream *substream,
runtime->buffer = newbuf;
runtime->buffer_size = params->buffer_size;
__reset_runtime_ptrs(runtime, is_input);
- spin_unlock_irq(&substream->lock);
kvfree(oldbuf);
}
runtime->avail_min = params->avail_min;
You can see that after your patch, kvfree() is called while
guard(spinlock_irq)(&substream->lock); is still holding the lock.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [sound?] BUG: sleeping function called from invalid context in vfree
2024-11-25 14:07 ` Eric Dumazet
@ 2024-11-25 14:13 ` Takashi Iwai
0 siblings, 0 replies; 5+ messages in thread
From: Takashi Iwai @ 2024-11-25 14:13 UTC (permalink / raw)
To: Eric Dumazet
Cc: Takashi Iwai, syzbot, linux-kernel, linux-sound, perex,
syzkaller-bugs, tiwai
On Mon, 25 Nov 2024 15:07:50 +0100,
Eric Dumazet wrote:
>
>
> On 11/25/24 2:34 PM, Takashi Iwai wrote:
> > On Mon, 25 Nov 2024 13:58:09 +0100,
> > Eric Dumazet wrote:
> >>
> >> On 11/25/24 1:54 PM, syzbot wrote:
> >>> Hello,
> >>>
> >>> syzbot found the following issue on:
> >>>
> >>> HEAD commit: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
> >>> git tree: upstream
> >>> console output: https://syzkaller.appspot.com/x/log.txt?x=154bc778580000
> >>> kernel config: https://syzkaller.appspot.com/x/.config?x=47cc5fc1922531f
> >>> dashboard link: https://syzkaller.appspot.com/bug?extid=351f8764833934c68836
> >>> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> >>> userspace arch: i386
> >>>
> >>> Unfortunately, I don't have any reproducer for this issue yet.
> >>>
> >>> Downloadable assets:
> >>> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9f16d5e6.raw.xz
> >>> vmlinux: https://storage.googleapis.com/syzbot-assets/dddd5525a287/vmlinux-9f16d5e6.xz
> >>> kernel image: https://storage.googleapis.com/syzbot-assets/7c9e082ba50b/bzImage-9f16d5e6.xz
> >>>
> >>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> >>> Reported-by: syzbot+351f8764833934c68836@syzkaller.appspotmail.com
> >>>
> >>> BUG: sleeping function called from invalid context at mm/vmalloc.c:3359
> >>> in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 6938, name: syz.1.230
> >>> preempt_count: 1, expected: 0
> >>> RCU nest depth: 0, expected: 0
> >>> 2 locks held by syz.1.230/6938:
> >>> #0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
> >>> #0: ffff88804a2d2968 (&rmidi->open_mutex){+.+.}-{4:4}, at: snd_rawmidi_output_params+0x51/0x1c0 sound/core/rawmidi.c:748
> >>> #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
> >>> #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: class_spinlock_irq_constructor include/linux/spinlock.h:565 [inline]
> >>> #1: ffff888045e5ed48 (&substream->lock){....}-{3:3}, at: resize_runtime_buffer+0x243/0x530 sound/core/rawmidi.c:727
> >>> irq event stamp: 1218
> >>> hardirqs last enabled at (1217): [<ffffffff8b189e32>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
> >>> hardirqs last enabled at (1217): [<ffffffff8b189e32>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
> >>> hardirqs last disabled at (1218): [<ffffffff8b189ad5>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
> >>> hardirqs last disabled at (1218): [<ffffffff8b189ad5>] _raw_spin_lock_irq+0x45/0x50 kernel/locking/spinlock.c:170
> >>> softirqs last enabled at (0): [<ffffffff814e57ac>] copy_process+0x1e9c/0x6f20 kernel/fork.c:2321
> >>> softirqs last disabled at (0): [<0000000000000000>] 0x0
> >>> Preemption disabled at:
> >>> [<0000000000000000>] 0x0
> >>> CPU: 1 UID: 0 PID: 6938 Comm: syz.1.230 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
> >>> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> >>> Call Trace:
> >>> <TASK>
> >>> __dump_stack lib/dump_stack.c:94 [inline]
> >>> dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
> >>> __might_resched+0x3c0/0x5e0 kernel/sched/core.c:8758
> >>> vfree+0x75/0x890 mm/vmalloc.c:3359
> >>> kvfree+0x33/0x50 mm/util.c:699
> >>> resize_runtime_buffer+0x3a7/0x530 sound/core/rawmidi.c:736
> >>> snd_rawmidi_output_params+0xeb/0x1c0 sound/core/rawmidi.c:751
> >>> snd_rawmidi_ioctl_params_compat sound/core/rawmidi_compat.c:37 [inline]
> >>> snd_rawmidi_ioctl_compat+0x3ac/0x3e0 sound/core/rawmidi_compat.c:120
> >>> __do_compat_sys_ioctl+0x1cb/0x2c0 fs/ioctl.c:1004
> >>> do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
> >>> __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
> >>> do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
> >>> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
> >>> RIP: 0023:0xf7f01579
> >>> Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
> >>> RSP: 002b:00000000f506555c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
> >>> RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00000000c0205710
> >>> RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000000
> >>> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> >>> R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
> >>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> >>> </TASK>
> >>> ----------------
> >>> Code disassembly (best guess), 2 bytes skipped:
> >>> 0: 10 06 adc %al,(%rsi)
> >>> 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
> >>> 6: 10 07 adc %al,(%rdi)
> >>> 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
> >>> c: 10 08 adc %cl,(%rax)
> >>> e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
> >>> 1e: 00 51 52 add %dl,0x52(%rcx)
> >>> 21: 55 push %rbp
> >>> 22: 89 e5 mov %esp,%ebp
> >>> 24: 0f 34 sysenter
> >>> 26: cd 80 int $0x80
> >>> * 28: 5d pop %rbp <-- trapping instruction
> >>> 29: 5a pop %rdx
> >>> 2a: 59 pop %rcx
> >>> 2b: c3 ret
> >>> 2c: 90 nop
> >>> 2d: 90 nop
> >>> 2e: 90 nop
> >>> 2f: 90 nop
> >>> 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
> >>> 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
> >>>
> >>>
> >>> ---
> >>> This report is generated by a bot. It may contain errors.
> >>> See https://goo.gl/tpsmEJ for more information about syzbot.
> >>> syzbot engineers can be reached at syzkaller@googlegroups.com.
> >>>
> >>> syzbot will keep track of this issue. See:
> >>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >>>
> >>> If the report is already addressed, let syzbot know by replying with:
> >>> #syz fix: exact-commit-title
> >>>
> >>> If you want to overwrite report's subsystems, reply with:
> >>> #syz set subsystems: new-subsystem
> >>> (See the list of subsystem names on the web dashboard)
> >>>
> >>> If the report is a duplicate of another one, reply with:
> >>> #syz dup: exact-subject-of-another-report
> >>>
> >>> If you want to undo deduplication, reply with:
> >>> #syz undup
> >>
> >> Bug added in
> >>
> >> commit 84bb065b316e8367e14a8824a8f4d21056b10c53
> >> Author: Takashi Iwai <tiwai@suse.de>
> >> Date: Tue Feb 27 09:52:51 2024 +0100
> >>
> >> ALSA: rawmidi: Use guard() for locking
> >>
> >> We can simplify the code gracefully with new guard() macro and co for
> >> automatic cleanup of locks.
> >>
> >> There are a few remaining explicit mutex and spinlock calls, and those
> >> are the places where the temporary unlock/relocking happens -- which
> >> guard() doens't cover well yet.
> >>
> >> Only the code refactoring, and no functional changes.
> >>
> >> Signed-off-by: Takashi Iwai <tiwai@suse.de>
> >> Link:https://lore.kernel.org/r/20240227085306.9764-10-tiwai@suse.de
> >> <https://lore.kernel.org/r/20240227085306.9764-10-tiwai@suse.de>
> > Hmm, through a quick glance, I don't see anything breaking there.
> >
> > Could you tell me which code path introduced the spinlock held during
> > kvzalloc() call in resize_runtime_buffer() in sound/core/rawmidi.c by
> > this commit...?
>
>
> @@ -744,9 +724,8 @@ static int resize_runtime_buffer(struct
> snd_rawmidi_substream *substream,
> newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
> if (!newbuf)
> return -ENOMEM;
> - spin_lock_irq(&substream->lock);
> + guard(spinlock_irq)(&substream->lock);
> if (runtime->buffer_ref) {
> - spin_unlock_irq(&substream->lock);
> kvfree(newbuf);
> return -EBUSY;
> }
> @@ -754,7 +733,6 @@ static int resize_runtime_buffer(struct
> snd_rawmidi_substream *substream,
> runtime->buffer = newbuf;
> runtime->buffer_size = params->buffer_size;
> __reset_runtime_ptrs(runtime, is_input);
> - spin_unlock_irq(&substream->lock);
> kvfree(oldbuf);
> }
> runtime->avail_min = params->avail_min;
>
>
> You can see that after your patch, kvfree() is called while
>
> guard(spinlock_irq)(&substream->lock); is still holding the lock.
Ah, thanks, it's it's kvfree() call, not kvzalloc().
Will submit the fix patch soon later.
Takashi
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-11-25 14:14 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-11-25 12:54 [syzbot] [sound?] BUG: sleeping function called from invalid context in vfree syzbot
2024-11-25 12:58 ` Eric Dumazet
2024-11-25 13:34 ` Takashi Iwai
2024-11-25 14:07 ` Eric Dumazet
2024-11-25 14:13 ` Takashi Iwai
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