[syzbot] INFO: task hung in path_openat (7)

[syzbot] INFO: task hung in path_openat (7)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    2bca25eaeba6 Merge tag 'spi-v6.1' of git://git.kernel.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10ff71a2880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9df203be43a870b5
dashboard link: https://syzkaller.appspot.com/bug?extid=950a0cdaa2fdd14f5bdc
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9885e6765755/disk-2bca25ea.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6e78c91286aa/vmlinux-2bca25ea.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+950a0cdaa2fdd14f5bdc-Pl5Pbv+GP7P466ipTTIvnc23WoclnBCfAL8bYrjMMd8@public.gmane.org

INFO: task syz-executor.0:4146 blocked for more than 143 seconds.
      Not tainted 6.0.0-syzkaller-03015-g2bca25eaeba6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:24016 pid: 4146 ppid:  3642 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5183 [inline]
 __schedule+0x91f/0xdf0 kernel/sched/core.c:6495
 schedule+0xcb/0x190 kernel/sched/core.c:6571
 rwsem_down_write_slowpath+0xf1c/0x1350 kernel/locking/rwsem.c:1182
 __down_write_common kernel/locking/rwsem.c:1297 [inline]
 __down_write kernel/locking/rwsem.c:1306 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1553
 inode_lock include/linux/fs.h:756 [inline]
 open_last_lookups fs/namei.c:3478 [inline]
 path_openat+0x7b9/0x2df0 fs/namei.c:3688
 do_filp_open+0x264/0x4f0 fs/namei.c:3718
 do_sys_openat2+0x124/0x4e0 fs/open.c:1313
 do_sys_open fs/open.c:1329 [inline]
 __do_sys_creat fs/open.c:1405 [inline]
 __se_sys_creat fs/open.c:1399 [inline]
 __x64_sys_creat+0x11f/0x160 fs/open.c:1399
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f437d08a5a9
RSP: 002b:00007f437bffe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f437d1ac050 RCX: 00007f437d08a5a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080
RBP: 00007f437d0e5580 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff063c0d0f R14: 00007f437bffe300 R15: 0000000000022000
 </TASK>
INFO: task segctord:4132 blocked for more than 143 seconds.
      Not tainted 6.0.0-syzkaller-03015-g2bca25eaeba6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:segctord        state:D stack:24832 pid: 4132 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5183 [inline]
 __schedule+0x91f/0xdf0 kernel/sched/core.c:6495
 schedule+0xcb/0x190 kernel/sched/core.c:6571
 rwsem_down_write_slowpath+0xf1c/0x1350 kernel/locking/rwsem.c:1182
 __down_write_common kernel/locking/rwsem.c:1297 [inline]
 __down_write kernel/locking/rwsem.c:1306 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1553
 nilfs_transaction_lock+0x246/0x4b0 fs/nilfs2/segment.c:357
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2482 [inline]
 nilfs_segctor_thread+0x52a/0x1180 fs/nilfs2/segment.c:2566
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8cb21db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/14:
 #0: ffffffff8cb225b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/29:
 #0: ffffffff8cb21be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/u4:4/93:
2 locks held by getty/3285:
 #0: ffff88814ad5c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x53b/0x1650 drivers/tty/n_tty.c:2177
1 lock held by syz-fuzzer/3631:
6 locks held by syz-executor.0/4125:
2 locks held by syz-executor.0/4146:
 #0: ffff8880302f4460 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393
 #1: ffff8880713f95e0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff8880713f95e0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3478 [inline]
 #1: ffff8880713f95e0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x7b9/0x2df0 fs/namei.c:3688
1 lock held by segctord/4132:
 #0: ffff88802e7da2a0 (&nilfs->ns_segctor_sem){++++}-{3:3}, at: nilfs_transaction_lock+0x246/0x4b0 fs/nilfs2/segment.c:357
2 locks held by kworker/u4:6/4564:
 #0: ffff888145a55138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x7f2/0xdb0
 #1: ffffc9000cacfd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264
2 locks held by syz-executor.0/4936:
 #0: ffff8880302f40e0 (&type->s_umount_key#78){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:721
 #1: ffff8881475b07d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
 #1: ffff8881475b07d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x264/0xaa0 fs/fs-writeback.c:2691
2 locks held by syz-executor.0/4939:
 #0: ffff8880302f40e0 (&type->s_umount_key#78){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:721
 #1: ffff8881475b07d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
 #1: ffff8881475b07d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x264/0xaa0 fs/fs-writeback.c:2691
2 locks held by syz-executor.0/5095:
 #0: ffff8880302f40e0 (&type->s_umount_key#78){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:721
 #1: ffff8881475b07d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
 #1: ffff8881475b07d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x264/0xaa0 fs/fs-writeback.c:2691
2 locks held by syz-executor.0/5096:
 #0: ffff8880302f40e0 (&type->s_umount_key#78){++++}-{3:3}, at: iterate_supers+0xb0/0x1f0 fs/super.c:721
 #1: ffff8881475b07d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
 #1: ffff8881475b07d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x264/0xaa0 fs/fs-writeback.c:2691

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.0.0-syzkaller-03015-g2bca25eaeba6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 nmi_cpu_backtrace+0x425/0x450 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x169/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xcd5/0xd20 kernel/hung_task.c:369
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 93 Comm: kworker/u4:4 Not tainted 6.0.0-syzkaller-03015-g2bca25eaeba6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5407 [inline]
RIP: 0010:lock_is_held_type+0xa1/0x180 kernel/locking/lockdep.c:5709
Code: 83 bd 70 0a 00 00 00 7e 4b 4c 89 ed 48 81 c5 78 0a 00 00 31 db 0f 1f 40 00 48 83 fb 31 73 24 48 89 ef 4c 89 fe e8 ff 01 00 00 <85> c0 75 2a 48 ff c3 49 63 85 70 0a 00 00 48 83 c5 28 48 39 c3 7c
RSP: 0018:ffffc900015f7998 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8cb21b60 RDI: ffff888019238aa0
RBP: ffff888019238aa0 R08: dffffc0000000000 R09: fffffbfff1c188fe
R10: fffffbfff1c188fe R11: 1ffffffff1c188fd R12: 0000000000000246
R13: ffff888019238000 R14: 00000000ffffffff R15: ffffffff8cb21b60
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00f1c8000 CR3: 0000000020bff000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_is_held include/linux/lockdep.h:283 [inline]
 rcu_read_lock_sched_held+0x87/0x110 kernel/rcu/update.c:125
 trace_lock_release+0x7b/0x1a0 include/trace/events/lock.h:69
 lock_release+0x81/0x820 kernel/locking/lockdep.c:5677
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0x251/0x5b0 net/batman-adv/network-coding.c:719
 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>


---
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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

Re: [syzbot] [fs] INFO: task hung in path_openat (7)

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    b831f83e40a2 Merge tag 'bpf-6.11-rc7' of git://git.kernel...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13ceca8b980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8926d683f62db53e
dashboard link: https://syzkaller.appspot.com/bug?extid=950a0cdaa2fdd14f5bdc
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11849200580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12472ffb980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7de57e317906/disk-b831f83e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/83081a33fb63/vmlinux-b831f83e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1a98ffa98a52/bzImage-b831f83e.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/9f8e1f401e6c/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+950a0cdaa2fdd14f5bdc@syzkaller.appspotmail.com

INFO: task syz-executor292:5263 blocked for more than 143 seconds.
      Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor292 state:D stack:27952 pid:5263  tgid:5250  ppid:5245   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common kernel/locking/rwsem.c:1306 [inline]
 __down_write kernel/locking/rwsem.c:1315 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1580
 inode_lock include/linux/fs.h:800 [inline]
 open_last_lookups fs/namei.c:3644 [inline]
 path_openat+0x7fb/0x3470 fs/namei.c:3883
 do_filp_open+0x235/0x490 fs/namei.c:3913
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_open fs/open.c:1439 [inline]
 __se_sys_open fs/open.c:1435 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1435
 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: 0033:0x7f4a1e867bc9
RSP: 002b:00007f4a1e7fc218 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f4a1e8f96b8 RCX: 00007f4a1e867bc9
RDX: 0000000000000000 RSI: 000000000010b942 RDI: 0000000020000080
RBP: 00007f4a1e8f96b0 R08: 00007ffee00fdc47 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a1e8f96bc
R13: 00007f4a1e8bc0c0 R14: 0031656c69662f2e R15: 0030656c69662f2e
 </TASK>
INFO: task syz-executor292:5264 blocked for more than 144 seconds.
      Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor292 state:D stack:27952 pid:5264  tgid:5251  ppid:5246   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common kernel/locking/rwsem.c:1306 [inline]
 __down_write kernel/locking/rwsem.c:1315 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1580
 inode_lock include/linux/fs.h:800 [inline]
 open_last_lookups fs/namei.c:3644 [inline]
 path_openat+0x7fb/0x3470 fs/namei.c:3883
 do_filp_open+0x235/0x490 fs/namei.c:3913
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_open fs/open.c:1439 [inline]
 __se_sys_open fs/open.c:1435 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1435
 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: 0033:0x7f4a1e867bc9
RSP: 002b:00007f4a1e7fc218 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f4a1e8f96b8 RCX: 00007f4a1e867bc9
RDX: 0000000000000000 RSI: 000000000010b942 RDI: 0000000020000080
RBP: 00007f4a1e8f96b0 R08: 00007ffee00fdc47 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a1e8f96bc
R13: 00007f4a1e8bc0c0 R14: 0031656c69662f2e R15: 0030656c69662f2e
 </TASK>
INFO: task syz-executor292:5265 blocked for more than 145 seconds.
      Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor292 state:D stack:27952 pid:5265  tgid:5253  ppid:5248   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common kernel/locking/rwsem.c:1306 [inline]
 __down_write kernel/locking/rwsem.c:1315 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1580
 inode_lock include/linux/fs.h:800 [inline]
 open_last_lookups fs/namei.c:3644 [inline]
 path_openat+0x7fb/0x3470 fs/namei.c:3883
 do_filp_open+0x235/0x490 fs/namei.c:3913
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_open fs/open.c:1439 [inline]
 __se_sys_open fs/open.c:1435 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1435
 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: 0033:0x7f4a1e867bc9
RSP: 002b:00007f4a1e7fc218 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f4a1e8f96b8 RCX: 00007f4a1e867bc9
RDX: 0000000000000000 RSI: 000000000010b942 RDI: 0000000020000080
RBP: 00007f4a1e8f96b0 R08: 00007ffee00fdc47 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a1e8f96bc
R13: 00007f4a1e8bc0c0 R14: 0031656c69662f2e R15: 0030656c69662f2e
 </TASK>
INFO: task syz-executor292:5266 blocked for more than 146 seconds.
      Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor292 state:D stack:27928 pid:5266  tgid:5254  ppid:5247   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common kernel/locking/rwsem.c:1306 [inline]
 __down_write kernel/locking/rwsem.c:1315 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1580
 inode_lock include/linux/fs.h:800 [inline]
 open_last_lookups fs/namei.c:3644 [inline]
 path_openat+0x7fb/0x3470 fs/namei.c:3883
 do_filp_open+0x235/0x490 fs/namei.c:3913
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_open fs/open.c:1439 [inline]
 __se_sys_open fs/open.c:1435 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1435
 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: 0033:0x7f4a1e867bc9
RSP: 002b:00007f4a1e7fc218 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f4a1e8f96b8 RCX: 00007f4a1e867bc9
RDX: 0000000000000000 RSI: 000000000010b942 RDI: 0000000020000080
RBP: 00007f4a1e8f96b0 R08: 00007ffee00fdc47 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a1e8f96bc
R13: 00007f4a1e8bc0c0 R14: 0031656c69662f2e R15: 0030656c69662f2e
 </TASK>
INFO: task syz-executor292:5262 blocked for more than 147 seconds.
      Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor292 state:D stack:27320 pid:5262  tgid:5255  ppid:5249   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common kernel/locking/rwsem.c:1306 [inline]
 __down_write kernel/locking/rwsem.c:1315 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1580
 inode_lock include/linux/fs.h:800 [inline]
 open_last_lookups fs/namei.c:3644 [inline]
 path_openat+0x7fb/0x3470 fs/namei.c:3883
 do_filp_open+0x235/0x490 fs/namei.c:3913
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_open fs/open.c:1439 [inline]
 __se_sys_open fs/open.c:1435 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1435
 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: 0033:0x7f4a1e867bc9
RSP: 002b:00007f4a1e7fc218 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f4a1e8f96b8 RCX: 00007f4a1e867bc9
RDX: 0000000000000000 RSI: 000000000010b942 RDI: 0000000020000080
RBP: 00007f4a1e8f96b0 R08: 00007ffee00fdc47 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a1e8f96bc
R13: 00007f4a1e8bc0c0 R14: 0031656c69662f2e R15: 0030656c69662f2e
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 #0: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
1 lock held by kswapd0/89:
2 locks held by getty/4976:
 #0: ffff88803030c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
2 locks held by syz-executor292/5257:
1 lock held by syz-executor292/5263:
 #0: ffff8880783006c0 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: inode_lock include/linux/fs.h:800 [inline]
 #0: ffff8880783006c0 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: open_last_lookups fs/namei.c:3644 [inline]
 #0: ffff8880783006c0 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: path_openat+0x7fb/0x3470 fs/namei.c:3883
1 lock held by syz-executor292/5256:
1 lock held by syz-executor292/5264:
 #0: ffff888078300180 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: inode_lock include/linux/fs.h:800 [inline]
 #0: ffff888078300180 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: open_last_lookups fs/namei.c:3644 [inline]
 #0: ffff888078300180 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: path_openat+0x7fb/0x3470 fs/namei.c:3883
1 lock held by syz-executor292/5258:
1 lock held by syz-executor292/5265:
 #0: ffff8880783c06c0 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: inode_lock include/linux/fs.h:800 [inline]
 #0: ffff8880783c06c0 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: open_last_lookups fs/namei.c:3644 [inline]
 #0: ffff8880783c06c0 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: path_openat+0x7fb/0x3470 fs/namei.c:3883
1 lock held by syz-executor292/5259:
1 lock held by syz-executor292/5266:
 #0: ffff888078300c00 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: inode_lock include/linux/fs.h:800 [inline]
 #0: ffff888078300c00 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: open_last_lookups fs/namei.c:3644 [inline]
 #0: ffff888078300c00 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: path_openat+0x7fb/0x3470 fs/namei.c:3883
2 locks held by syz-executor292/5260:
1 lock held by syz-executor292/5262:
 #0: ffff8880783c0180 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: inode_lock include/linux/fs.h:800 [inline]
 #0: ffff8880783c0180 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: open_last_lookups fs/namei.c:3644 [inline]
 #0: ffff8880783c0180 (&type->i_mutex_dir_key#6){++++}-{3:3}, at: path_openat+0x7fb/0x3470 fs/namei.c:3883

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5259 Comm: syz-executor292 Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:209
Code: 89 fb e8 23 00 00 00 48 8b 3d bc 26 75 0c 48 89 de 5b e9 53 75 58 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 c0 d6 03 00 65 8b 15 50 4a
RSP: 0018:ffffc90003796ee0 EFLAGS: 00000246
RAX: ffffffff90106f08 RBX: ffffffff90106f0c RCX: ffff88807f0ebc00
RDX: 0000000000000000 RSI: ffffffff82086c46 RDI: ffffffff82086c88
RBP: ffffffff82086c88 R08: ffffffff81412c60 R09: ffffc900037970b0
R10: 0000000000000003 R11: ffffffff817f2f30 R12: ffffffff90106f08
R13: ffffffff90106f08 R14: ffffffff82086c46 R15: ffffffff90106f08
FS:  00007f4a1e81d6c0(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559ac1abfe30 CR3: 00000000287e6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __orc_find arch/x86/kernel/unwind_orc.c:99 [inline]
 orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
 unwind_next_frame+0x531/0x2a00 arch/x86/kernel/unwind_orc.c:494
 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3992 [inline]
 slab_alloc_node mm/slub.c:4041 [inline]
 kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4048
 alloc_buffer_head+0x2a/0x290 fs/buffer.c:3025
 folio_alloc_buffers+0x241/0x5b0 fs/buffer.c:929
 create_empty_buffers+0x3a/0x740 fs/buffer.c:1671
 block_read_full_folio+0x25c/0xcd0 fs/buffer.c:2387
 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2355
 do_read_cache_folio+0x134/0x820 mm/filemap.c:3789
 do_read_cache_page+0x30/0x200 mm/filemap.c:3855
 read_mapping_page include/linux/pagemap.h:907 [inline]
 dir_get_page fs/sysv/dir.c:64 [inline]
 sysv_find_entry+0x1af/0x410 fs/sysv/dir.c:157
 sysv_inode_by_name+0x98/0x1f0 fs/sysv/dir.c:374
 sysv_lookup+0x6b/0xe0 fs/sysv/namei.c:38
 lookup_open fs/namei.c:3556 [inline]
 open_last_lookups fs/namei.c:3647 [inline]
 path_openat+0x11cc/0x3470 fs/namei.c:3883
 do_filp_open+0x235/0x490 fs/namei.c:3913
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1442
 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: 0033:0x7f4a1e867bc9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4a1e81d218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4a1e8f96a8 RCX: 00007f4a1e867bc9
RDX: 0000000000000800 RSI: 0000000020000240 RDI: 00000000ffffff9c
RBP: 00007f4a1e8f96a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000039 R11: 0000000000000246 R12: 00007f4a1e8f96ac
R13: 00007f4a1e8bc0c0 R14: 0031656c69662f2e R15: 0030656c69662f2e
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.204 msecs


---
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