INFO: task syz.0.17:6037 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17        state:D
 stack:28424 pid:6037  tgid:6035  ppid:5974   task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5360 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
 __schedule_loop kernel/sched/core.c:7046 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7061
 io_schedule+0x80/0xd0 kernel/sched/core.c:7906
 folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1330
 folio_put_wait_locked mm/filemap.c:1494 [inline]
 do_read_cache_folio+0x1aa/0x590 mm/filemap.c:3973
 read_mapping_folio include/linux/pagemap.h:999 [inline]
 erofs_bread+0x46f/0x7f0 fs/erofs/data.c:40
 erofs_readdir+0x58a/0x1020 fs/erofs/dir.c:81
 iterate_dir+0x399/0x570 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:410 [inline]
 __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff55798eba9
RSP: 002b:00007ff556fdd038 EFLAGS: 00000246
 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007ff557bd6090 RCX: 00007ff55798eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007ff557a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff557bd6128 R14: 00007ff557bd6090 R15: 00007fff0cc9f908
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5625:
 #0: ffff88814dda20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000331e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by syz.0.17/6036:
2 locks held by syz.0.17/6037:
 #0: 
ffff8880330182b8
 (
&f->f_pos_lock
){+.+.}-{4:4}
, at: fdget_pos+0x247/0x320 fs/file.c:1232
 #1: 
ffff88805c6446d0
 (
&type->i_mutex_dir_key
#8
){.+.+}-{4:4}
, at: iterate_dir+0x292/0x570 fs/readdir.c:101
3 locks held by syz.1.18/6064:
2 locks held by syz.1.18/6065:
 #0: 
ffff88807ab56638
 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1232
 #1: ffff88805c645150 (&type->i_mutex_dir_key#8){.+.+}-{4:4}, at: iterate_dir+0x292/0x570 fs/readdir.c:101
3 locks held by syz.2.19/6097:
2 locks held by syz.2.19/6098:
 #0: ffff88807e535278 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1232
 #1: ffff88805c645bd0 (&type->i_mutex_dir_key#8){.+.+}-{4:4}, at: iterate_dir+0x292/0x570 fs/readdir.c:101
3 locks held by syz.3.20/6121:
2 locks held by syz.3.20/6122:
 #0: ffff88807e5567f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1232
 #1: ffff88805c646650 (&type->i_mutex_dir_key#8){.+.+}-{4:4}, at: iterate_dir+0x292/0x570 fs/readdir.c:101
3 locks held by syz.4.21/6160:
2 locks held by syz.4.21/6161:
 #0: ffff88802eba30b8 (&f->f_pos_lock
){+.+.}-{4:4}
, at: fdget_pos+0x247/0x320 fs/file.c:1232
 #1: 
ffff88805c7e46d0
 (
&type->i_mutex_dir_key#8){.+.+}-{4:4}, at: iterate_dir+0x292/0x570 fs/readdir.c:101
3 locks held by syz.5.22/6192:
2 locks held by syz.5.22/6193:
 #0: 
ffff888052389978
 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1232
 #1: 
ffff88805c6470d0
 (
&type->i_mutex_dir_key#8){.+.+}-{4:4}, at: iterate_dir+0x292/0x570 fs/readdir.c:101
4 locks held by syz.6.23/6225:
2 locks held by syz.6.23/6226:
 #0: ffff8880273115f8 (&f->f_pos_lock
){+.+.}-{4:4}
, at: fdget_pos+0x247/0x320 fs/file.c:1232
 #1: ffff88805c647b50 (&type->i_mutex_dir_key#8){.+.+}-{4:4}, at: iterate_dir+0x292/0x570 fs/readdir.c:101

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
 watchdog+0xf60/0xfa0 kernel/hung_task.c:495
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6121 Comm: syz.3.20 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline]
RIP: 0010:sched_clock+0x23/0x60 arch/x86/kernel/tsc.c:289
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 e8 45 5e 57 00 65 ff 05 fe 22 5b 11 e8 79 7e 1a 0a 48 89 c3 31 f6 65 ff 0d ed 22 5b 11 <40> 0f 94 c5 40 0f 94 c6 bf 02 00 00 00 e8 1b 61 57 00 40 84 ed 75
RSP: 0018:ffffc90000a08888 EFLAGS: 00000006
RAX: 0000003a3387176b RBX: 0000003a3387176b RCX: 0000003b639a68a7
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffffff92c9c040
RBP: ffffc90000a08978 R08: 0000000000000000 R09: ffffffff819b71e9
R10: ffff88807e9d1ed8 R11: ffffed100fd3a3dd R12: 0000000000000001
R13: dffffc0000000000 R14: ffffc90000a08900 R15: 1ffff9200014111c
FS:  00007f0f6cae96c0(0000) GS:ffff888125ae8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555853d0e168 CR3: 000000007f7ea000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 sched_clock_cpu+0x74/0x430 kernel/sched/clock.c:397
 cpu_clock include/linux/sched/clock.h:93 [inline]
 psi_task_change+0xe1/0x340 kernel/sched/psi.c:920
 psi_enqueue kernel/sched/stats.h:166 [inline]
 enqueue_task+0x343/0x420 kernel/sched/core.c:2092
 activate_task kernel/sched/core.c:2132 [inline]
 ttwu_do_activate+0x1f3/0x870 kernel/sched/core.c:3741
 ttwu_queue kernel/sched/core.c:4004 [inline]
 try_to_wake_up+0x721/0x12b0 kernel/sched/core.c:4328
 autoremove_wake_function+0x17/0x100 kernel/sched/wait.c:403
 __wake_up_common kernel/sched/wait.c:108 [inline]
 __wake_up_common_lock+0x137/0x1f0 kernel/sched/wait.c:125
 irq_work_single+0xe1/0x240 kernel/irq_work.c:221
 irq_work_run_list kernel/irq_work.c:252 [inline]
 irq_work_tick+0x2c2/0x360 kernel/irq_work.c:277
 update_process_times+0x264/0x2f0 kernel/time/timer.c:2476
 tick_sched_handle kernel/time/tick-sched.c:276 [inline]
 tick_nohz_handler+0x39a/0x520 kernel/time/tick-sched.c:297
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x4e0/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2034 [inline]
RIP: 0010:vprintk_emit+0x49d/0x590 kernel/printk/printk.c:2422
Code: 0f 84 34 ff ff ff e8 72 9b 1f 00 fb eb 44 e8 6a 9b 1f 00 e8 15 e2 e2 09 4d 85 f6 74 94 e8 5b 9b 1f 00 fb 48 c7 c7 60 08 33 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 6b 3b
RSP: 0018:ffffc90002e37400 EFLAGS: 00000293
RAX: ffffffff81a02015 RBX: ffffffff81a01e6e RCX: ffff888025638000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e330860
RBP: ffffc90002e37510 R08: ffffffff8fc3f337 R09: 1ffffffff1f87e66
R10: dffffc0000000000 R11: fffffbfff1f87e67 R12: 0000000000000000
R13: 000000000000003d R14: 0000000000000200 R15: 1ffff920005c6e84
 _printk+0xcf/0x120 kernel/printk/printk.c:2448
 _erofs_printk+0x349/0x410 fs/erofs/super.c:33
 z_erofs_readahead+0x726/0xb40 fs/erofs/zdata.c:1919
 read_pages+0x17a/0x580 mm/readahead.c:163
 page_cache_ra_order+0x922/0xe70 mm/readahead.c:518
 page_cache_sync_readahead include/linux/pagemap.h:1377 [inline]
 erofs_readdir+0x564/0x1020 fs/erofs/dir.c:77
 iterate_dir+0x399/0x570 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:410 [inline]
 __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0f6bb8eba9
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:00007f0f6cae9038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f0f6bdd5fa0 RCX: 00007f0f6bb8eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f0f6bc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0f6bdd6038 R14: 00007f0f6bdd5fa0 R15: 00007ffc50a9bea8
 </TASK>