syzbot

INFO: task syz-executor.0:5086 blocked for more than 143 seconds.
      Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:19248 pid:5086  tgid:5086  ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x17d3/0x4a20 kernel/sched/core.c:6736
 __schedule_loop kernel/sched/core.c:6813 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6828
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 fuse_lock_inode+0xd3/0x120 fs/fuse/inode.c:544
 fuse_lookup+0x115/0x600 fs/fuse/dir.c:424
 __lookup_slow+0x28e/0x3f0 fs/namei.c:1692
 lookup_slow+0x53/0x70 fs/namei.c:1709
 walk_component fs/namei.c:2004 [inline]
 link_path_walk+0x9ea/0xea0 fs/namei.c:2331
 path_openat+0x24a/0x3240 fs/namei.c:3795
 do_filp_open+0x235/0x490 fs/namei.c:3826
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_openat fs/open.c:1437 [inline]
 __se_sys_openat fs/open.c:1432 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1432
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f07d0c7d801
RSP: 002b:00007ffd51254b00 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f07d0c7d801
RDX: 0000000000090800 RSI: 00007f07d0cc945d RDI: 00000000ffffff9c
RBP: 00007ffd51254bcc R08: 0000000000000000 R09: 00007f07d19390b0
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 00000000000152b5 R14: 00000000000151d2 R15: 0000000000000006
 </TASK>
INFO: task syz-executor.0:5105 blocked for more than 143 seconds.
      Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:23896 pid:5105  tgid:5103  ppid:5086   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x17d3/0x4a20 kernel/sched/core.c:6736
 __schedule_loop kernel/sched/core.c:6813 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6828
 request_wait_answer fs/fuse/dev.c:407 [inline]
 __fuse_request_send fs/fuse/dev.c:426 [inline]
 fuse_simple_request+0x1199/0x1b90 fs/fuse/dev.c:513
 fuse_lookup_name+0x332/0x830 fs/fuse/dir.c:386
 fuse_lookup+0x182/0x600 fs/fuse/dir.c:425
 __lookup_slow+0x28e/0x3f0 fs/namei.c:1692
 lookup_slow+0x53/0x70 fs/namei.c:1709
 walk_component fs/namei.c:2004 [inline]
 link_path_walk+0x9ea/0xea0 fs/namei.c:2331
 path_openat+0x24a/0x3240 fs/namei.c:3795
 do_filp_open+0x235/0x490 fs/namei.c:3826
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_openat fs/open.c:1437 [inline]
 __se_sys_openat fs/open.c:1432 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1432
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f07d0c7c9a0
RSP: 002b:00007f07d1916e30 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f07d0c7c9a0
RDX: 0000000000000002 RSI: 00007f07d1916f40 RDI: 00000000ffffff9c
RBP: 00007f07d1916f40 R08: 0000000000000000 R09: 0000000000000427
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000004
R13: 00007f07d1916f80 R14: 00007f07d1916f40 R15: 00007f07c7a00000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4825:
 #0: ffff88802a1e50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
2 locks held by syz-executor.0/5086:
 #0: ffff8880786a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:803 [inline]
 #0: ffff8880786a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1708
 #1: ffff8880786a85c8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xd3/0x120 fs/fuse/inode.c:544
2 locks held by syz-executor.0/5105:
 #0: ffff8880786a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:803 [inline]
 #0: ffff8880786a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1708
 #1: ffff8880786a85c8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xd3/0x120 fs/fuse/inode.c:544

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 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:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfb0/0xff0 kernel/hung_task.c:379
 kthread+0x2f2/0x390 kernel/kthread.c:388
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4506 Comm: syslogd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:check_preemption_disabled+0x2/0x120 lib/smp_processor_id.c:13
Code: d2 fe 8b 48 c7 c6 e0 d2 fe 8b eb 1c 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 <41> 56 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24
RSP: 0018:ffffc9000314fb68 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000001
RDX: ffff88807e7a5a00 RSI: ffffffff8baad360 RDI: ffffffff8bfed300
RBP: ffffc9000314fc48 R08: ffffffff82096910 R09: 1ffffffff1f0e74d
R10: dffffc0000000000 R11: fffffbfff1f0e74e R12: 0000000000000246
R13: ffff88807e7a5a00 R14: 00000000ffffffff R15: ffffffff8e132020
FS:  00007ff545500380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056355dc4d600 CR3: 000000002b200000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
 lock_is_held_type+0x101/0x190 kernel/locking/lockdep.c:5826
 lock_is_held include/linux/lockdep.h:231 [inline]
 rcu_read_lock_any_held+0x8d/0x160 kernel/rcu/update.c:386
 rcu_sync_is_idle include/linux/rcu_sync.h:34 [inline]
 percpu_up_read include/linux/percpu-rwsem.h:105 [inline]
 __sb_end_write include/linux/fs.h:1657 [inline]
 sb_end_write+0x49/0x1c0 include/linux/fs.h:1750
 file_end_write include/linux/fs.h:2873 [inline]
 vfs_write+0x786/0xcb0 fs/read_write.c:598
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7ff545654bf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc4bc83838 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007ff545654bf2
RDX: 000000000000005b RSI: 000056331e9dbc50 RDI: 0000000000000003
RBP: 000056331e9dbc50 R08: 0000000000000001 R09: 0000000000000000
R10: 00007ff5457f33a3 R11: 0000000000000246 R12: 000000000000005b
R13: 00007ff545500300 R14: 0000000000000004 R15: 000056331e9dba60
 </TASK>