INFO: task syz-executor.0:15045 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc7-syzkaller-00238-g005f6f34bd47 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:26608 pid:15045 tgid:15042 ppid:13825  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6874
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a3/0xd70 kernel/locking/mutex.c:752
 __fdget_pos+0x258/0x320 fs/file.c:1191
 fdget_pos include/linux/file.h:74 [inline]
 __do_sys_getdents64 fs/readdir.c:405 [inline]
 __se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:394
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f54ad87dda9
RSP: 002b:00007f54ae6190c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f54ad9ac050 RCX: 00007f54ad87dda9
RDX: 0000000000000029 RSI: 9999999999999999 RDI: 0000000000000006
RBP: 00007f54ad8ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f54ad9ac050 R15: 00007ffcdf76d908
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/0:0/8:
 #0: ffff8880b943c918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
 #1: ffff8880b9428988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988
2 locks held by kworker/1:1/27:
 #0: ffff888014c7a538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #0: ffff888014c7a538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
 #1: ffffc90000a2fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #1: ffffc90000a2fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
1 lock held by khungtaskd/29:
 #0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4815:
 #0: ffff88802a57c0a0 (&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+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
2 locks held by kworker/u4:12/5277:
3 locks held by syz-executor.0/15043:
1 lock held by syz-executor.0/15045:
 #0: ffff88807a136fc8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x258/0x320 fs/file.c:1191
2 locks held by syz-executor.2/17238:
1 lock held by syz-executor.0/17258:

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

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc7-syzkaller-00238-g005f6f34bd47 #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+0x1e7/0x2e0 lib/dump_stack.c:106
 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+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4510 Comm: udevd Not tainted 6.8.0-rc7-syzkaller-00238-g005f6f34bd47 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:unwind_next_frame+0x1b8/0x29e0 arch/x86/kernel/unwind_orc.c:494
Code: 2a 48 8b 44 24 30 42 80 3c 30 00 74 08 48 89 df e8 cd f0 b1 00 48 03 2b 48 8d 75 ff 31 ff e8 df 23 53 00 48 ff cd 4c 89 24 24 <4c> 89 7c 24 70 4c 89 6c 24 48 0f 84 41 01 00 00 48 c7 c3 00 00 00
RSP: 0018:ffffc900031af260 EFLAGS: 00000287
RAX: 0000000000000000 RBX: ffffc900031af3e8 RCX: ffff88807bf45940
RDX: ffffc900031af3d5 RSI: ffffffff8136fd41 RDI: 0000000000000000
RBP: ffffffff8136fd41 R08: ffffffff81404f01 R09: ffffffff814066c0
R10: 0000000000000003 R11: ffff88807bf45940 R12: ffffc900031af3a0
R13: ffffc900031af3f0 R14: dffffc0000000000 R15: ffffffff8136fd42
FS:  00007f5912ca5c80(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28a1584f00 CR3: 000000007b0a2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __unwind_start+0x645/0x7a0 arch/x86/kernel/unwind_orc.c:760
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0x102/0x1b0 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0x117/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:589
 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2121 [inline]
 slab_free mm/slub.c:4299 [inline]
 kfree+0x14a/0x380 mm/slub.c:4409
 smk_fetch+0x109/0x140 security/smack/smack_lsm.c:314
 smack_d_instantiate+0x748/0xa50 security/smack/smack_lsm.c:3575
 security_d_instantiate+0x9f/0x100 security/security.c:3896
 d_splice_alias+0x6f/0x330 fs/dcache.c:2973
 __lookup_slow+0x28c/0x3f0 fs/namei.c:1693
 lookup_slow+0x53/0x70 fs/namei.c:1710
 walk_component+0x2e1/0x410 fs/namei.c:2005
 lookup_last fs/namei.c:2462 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2486
 filename_lookup+0x255/0x610 fs/namei.c:2515
 user_path_at_empty+0x42/0x60 fs/namei.c:2924
 do_readlinkat+0x118/0x3b0 fs/stat.c:499
 __do_sys_readlink fs/stat.c:532 [inline]
 __se_sys_readlink fs/stat.c:529 [inline]
 __x64_sys_readlink+0x7f/0x90 fs/stat.c:529
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f5912917d47
Code: 73 01 c3 48 8b 0d e1 90 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd8618d2b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffd8618d2c8 RCX: 00007f5912917d47
RDX: 0000000000000400 RSI: 00007ffd8618d2c8 RDI: 00007ffd8618d7a8
RBP: 0000000000000400 R08: 0000557bc7396234 R09: 0000000000000000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007ffd8618d7a8
R13: 00007ffd8618d718 R14: 0000557bc738c910 R15: 0000000000000000
 </TASK>