From: syzbot <syzbot+2e6495950edcf7fbfccf@syzkaller.appspotmail.com>
To: jlbec@evilplan.org, joseph.qi@linux.alibaba.com,
linux-kernel@vger.kernel.org, mark@fasheh.com,
ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [ocfs2?] possible deadlock in ocfs2_page_mkwrite
Date: Thu, 12 Sep 2024 02:35:26 -0700 [thread overview]
Message-ID: <00000000000093a1ca0621e8d336@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 8d8d276ba2fb Merge tag 'trace-v6.11-rc6' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=119fa477980000
kernel config: https://syzkaller.appspot.com/x/.config?x=61d235cb8d15001c
dashboard link: https://syzkaller.appspot.com/bug?extid=2e6495950edcf7fbfccf
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-8d8d276b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d23708af23a4/vmlinux-8d8d276b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1aed2837c105/bzImage-8d8d276b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2e6495950edcf7fbfccf@syzkaller.appspotmail.com
loop0: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
and is ignored by this kernel. Remove the mand
option from the mount to silence this warning.
=======================================================
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #0 Not tainted
------------------------------------------------------
syz.0.0/5113 is trying to acquire lock:
ffff88804bc43f60 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_page_mkwrite+0x347/0xed0 fs/ocfs2/mmap.c:142
but task is already holding lock:
ffff88804ac2e518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x19b/0x480 mm/memory.c:3142
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (sb_pagefaults){.+.+}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1676 [inline]
sb_start_pagefault include/linux/fs.h:1841 [inline]
ocfs2_page_mkwrite+0x223/0xed0 fs/ocfs2/mmap.c:122
do_page_mkwrite+0x19b/0x480 mm/memory.c:3142
wp_page_shared mm/memory.c:3545 [inline]
do_wp_page+0x23d9/0x52f0 mm/memory.c:3695
handle_pte_fault+0x115a/0x6fc0 mm/memory.c:5537
__handle_mm_fault mm/memory.c:5664 [inline]
handle_mm_fault+0x1109/0x1bc0 mm/memory.c:5832
do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65
copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
copy_to_user_iter lib/iov_iter.c:25 [inline]
iterate_ubuf include/linux/iov_iter.h:29 [inline]
iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
iterate_and_advance include/linux/iov_iter.h:271 [inline]
_copy_to_iter+0x26b/0x1960 lib/iov_iter.c:185
copy_to_iter include/linux/uio.h:196 [inline]
get_random_bytes_user+0x1e5/0x420 drivers/char/random.c:464
__do_sys_getrandom drivers/char/random.c:1406 [inline]
__se_sys_getrandom drivers/char/random.c:1380 [inline]
__x64_sys_getrandom+0x152/0x250 drivers/char/random.c:1380
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&mm->mmap_lock){++++}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__might_fault+0xc6/0x120 mm/memory.c:6387
_inline_copy_to_user include/linux/uaccess.h:176 [inline]
_copy_to_user+0x2a/0xb0 lib/usercopy.c:26
copy_to_user include/linux/uaccess.h:209 [inline]
fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145
ocfs2_fiemap+0x9f1/0xf80 fs/ocfs2/extent_map.c:796
ioctl_fiemap fs/ioctl.c:220 [inline]
do_vfs_ioctl+0x1c07/0x2e50 fs/ioctl.c:841
__do_sys_ioctl fs/ioctl.c:905 [inline]
__se_sys_ioctl+0x81/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&oi->ip_alloc_sem){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
down_write+0x99/0x220 kernel/locking/rwsem.c:1579
ocfs2_page_mkwrite+0x347/0xed0 fs/ocfs2/mmap.c:142
do_page_mkwrite+0x19b/0x480 mm/memory.c:3142
wp_page_shared mm/memory.c:3545 [inline]
do_wp_page+0x23d9/0x52f0 mm/memory.c:3695
handle_pte_fault+0x115a/0x6fc0 mm/memory.c:5537
__handle_mm_fault mm/memory.c:5664 [inline]
handle_mm_fault+0x1109/0x1bc0 mm/memory.c:5832
do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65
copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
copy_to_user_iter lib/iov_iter.c:25 [inline]
iterate_ubuf include/linux/iov_iter.h:29 [inline]
iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
iterate_and_advance include/linux/iov_iter.h:271 [inline]
_copy_to_iter+0x26b/0x1960 lib/iov_iter.c:185
copy_to_iter include/linux/uio.h:196 [inline]
get_random_bytes_user+0x1e5/0x420 drivers/char/random.c:464
__do_sys_getrandom drivers/char/random.c:1406 [inline]
__se_sys_getrandom drivers/char/random.c:1380 [inline]
__x64_sys_getrandom+0x152/0x250 drivers/char/random.c:1380
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&oi->ip_alloc_sem --> &mm->mmap_lock --> sb_pagefaults
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(sb_pagefaults);
lock(&mm->mmap_lock);
lock(sb_pagefaults);
lock(&oi->ip_alloc_sem);
*** DEADLOCK ***
2 locks held by syz.0.0/5113:
#0: ffff888040731e18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline]
#0: ffff888040731e18 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5869 [inline]
#0: ffff888040731e18 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:5929
#1: ffff88804ac2e518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x19b/0x480 mm/memory.c:3142
stack backtrace:
CPU: 0 UID: 0 PID: 5113 Comm: syz.0.0 Not tainted 6.11.0-rc7-syzkaller-00020-g8d8d276ba2fb #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:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
down_write+0x99/0x220 kernel/locking/rwsem.c:1579
ocfs2_page_mkwrite+0x347/0xed0 fs/ocfs2/mmap.c:142
do_page_mkwrite+0x19b/0x480 mm/memory.c:3142
wp_page_shared mm/memory.c:3545 [inline]
do_wp_page+0x23d9/0x52f0 mm/memory.c:3695
handle_pte_fault+0x115a/0x6fc0 mm/memory.c:5537
__handle_mm_fault mm/memory.c:5664 [inline]
handle_mm_fault+0x1109/0x1bc0 mm/memory.c:5832
do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71
Code: 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 cc cc cc cc 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1
RSP: 0018:ffffc9000b62faf8 EFLAGS: 00050246
RAX: ffffffff84b01901 RBX: 0000000000000040 RCX: 0000000000000040
RDX: 0000000000000000 RSI: ffffc9000b62fd40 RDI: 0000000020000240
RBP: ffffc9000b62fc70 R08: ffffc9000b62fd7f R09: 1ffff920016c5faf
R10: dffffc0000000000 R11: fffff520016c5fb0 R12: 1ffff920016c5fc9
R13: 0000000020000240 R14: ffffc9000b62fe48 R15: ffffc9000b62fd40
copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
copy_to_user_iter lib/iov_iter.c:25 [inline]
iterate_ubuf include/linux/iov_iter.h:29 [inline]
iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
iterate_and_advance include/linux/iov_iter.h:271 [inline]
_copy_to_iter+0x26b/0x1960 lib/iov_iter.c:185
copy_to_iter include/linux/uio.h:196 [inline]
get_random_bytes_user+0x1e5/0x420 drivers/char/random.c:464
__do_sys_getrandom drivers/char/random.c:1406 [inline]
__se_sys_getrandom drivers/char/random.c:1380 [inline]
__x64_sys_getrandom+0x152/0x250 drivers/char/random.c:1380
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f375117def9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3751e92038 EFLAGS: 00000246 ORIG_RAX: 000000000000013e
RAX: ffffffffffffffda RBX: 00007f3751335f80 RCX: 00007f375117def9
RDX: 0000000000000000 RSI: 00000000ffffff9a RDI: 0000000020000240
RBP: 00007f37511f09f6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3751335f80 R15: 00007fff8387faa8
</TASK>
----------------
Code disassembly (best guess):
0: 75 f1 jne 0xfffffff3
2: c3 ret
3: cc int3
4: cc int3
5: cc int3
6: cc int3
7: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1)
e: 00 00
10: 48 8b 06 mov (%rsi),%rax
13: 48 89 07 mov %rax,(%rdi)
16: 48 83 c6 08 add $0x8,%rsi
1a: 48 83 c7 08 add $0x8,%rdi
1e: 83 e9 08 sub $0x8,%ecx
21: 74 df je 0x2
23: 83 f9 08 cmp $0x8,%ecx
26: 73 e8 jae 0x10
28: eb c9 jmp 0xfffffff3
* 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
2c: c3 ret
2d: cc int3
2e: cc int3
2f: cc int3
30: cc int3
31: 48 89 c8 mov %rcx,%rax
34: 48 c1 e9 03 shr $0x3,%rcx
38: 83 e0 07 and $0x7,%eax
3b: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi)
3e: 89 c1 mov %eax,%ecx
---
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
next reply other threads:[~2024-09-12 9:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-12 9:35 syzbot [this message]
2024-11-17 1:25 ` [syzbot] [ocfs2?] possible deadlock in ocfs2_page_mkwrite syzbot
2024-11-17 17:49 ` syzbot
2025-10-23 2:48 ` syzbot
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=00000000000093a1ca0621e8d336@google.com \
--to=syzbot+2e6495950edcf7fbfccf@syzkaller.appspotmail.com \
--cc=jlbec@evilplan.org \
--cc=joseph.qi@linux.alibaba.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mark@fasheh.com \
--cc=ocfs2-devel@lists.linux.dev \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.