INFO: task syz.0.142:6902 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.142 state:D stack:25640 pid:6902 tgid:6900 ppid:5598 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
jfs_flush_journal+0x719/0xf50 fs/jfs/jfs_logmgr.c:1561
jfs_sync_fs+0x7d/0xa0 fs/jfs/super.c:650
sync_filesystem+0x1ce/0x250 fs/sync.c:66
jfs_reconfigure+0xc6/0x990 fs/jfs/super.c:370
reconfigure_super+0x232/0x8f0 fs/super.c:1020
vfs_cmd_reconfigure fs/fsopen.c:268 [inline]
vfs_fsconfig_locked+0x171/0x320 fs/fsopen.c:297
__do_sys_fsconfig fs/fsopen.c:463 [inline]
__se_sys_fsconfig+0x6bf/0x810 fs/fsopen.c:350
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fac5727de59
RSP: 002b:00007fac554d6028 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007fac57505fa0 RCX: 00007fac5727de59
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000004
RBP: 00007fac57313e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fac57506038 R14: 00007fac57505fa0 R15: 00007ffd7ded0898
Showing all locks held in the system:
2 locks held by rcuc/1/28:
1 lock held by khungtaskd/38:
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
9 locks held by kworker/u8:3/56:
5 locks held by kworker/u8:8/1134:
2 locks held by getty/5351:
#0: ffff8880361cb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cbe2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
4 locks held by syz-executor/5593:
1 lock held by udevd/5691:
1 lock held by udevd/6466:
2 locks held by syz.0.142/6902:
#0: ffff888020b4de60 (&fc->uapi_mutex){+.+.}-{4:4}, at: __do_sys_fsconfig fs/fsopen.c:461 [inline]
#0: ffff888020b4de60 (&fc->uapi_mutex){+.+.}-{4:4}, at: __se_sys_fsconfig+0x693/0x810 fs/fsopen.c:350
#1: ffff88802b10e0d0 (&type->s_umount_key#59){+.+.}-{4:4}, at: vfs_cmd_reconfigure fs/fsopen.c:267 [inline]
#1: ffff88802b10e0d0 (&type->s_umount_key#59){+.+.}-{4:4}, at: vfs_fsconfig_locked+0x169/0x320 fs/fsopen.c:297
7 locks held by syz.5.347/8430:
4 locks held by syz.4.345/8399:
6 locks held by syz.6.348/8432:
4 locks held by syz.2.349/8438:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8432 Comm: syz.6.348 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x55/0xb0 kernel/rcu/tree.c:752
Code: 77 b3 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 ac 9c 84 00 48 c7 c3 58 7d 9e 92 49 03 1e 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d f9 38 f3 10 74 11 83 e0
RSP: 0018:ffffc90003d47128 EFLAGS: 00000802
RAX: 1ffff110170e67ab RBX: ffff8880b8733d58 RCX: 0000000080000003
RDX: 0000000000000000 RSI: ffffffff8bca5f60 RDI: ffffffff8bca5f20
RBP: ffffc90003a272c8 R08: ffffc90003a272df R09: 0000000000000000
R10: ffffc90003a272c8 R11: fffff52000744e5c R12: ffff88802f42e7e0
R13: ffffffff8b442975 R14: ffffffff8db377d8 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888125d4c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f7cdb0a6b0 CR3: 000000003b090000 CR4: 00000000003526f0
Call Trace:
trace_lock_release include/trace/events/lock.h:68 [inline]
lock_release+0x4b/0x3c0 kernel/locking/lockdep.c:5879
__raw_spin_unlock include/linux/spinlock_api_smp.h:167 [inline]
_raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:190
try_to_take_rt_mutex+0x835/0xb00 kernel/locking/rtmutex.c:1193
rtlock_slowlock_locked+0xfb/0x3c20 kernel/locking/rtmutex.c:1866
rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
spin_lock include/linux/spinlock_rt.h:45 [inline]
__lru_cache_activate_folio+0x143/0x5a0 mm/swap.c:401
folio_mark_accessed+0x288/0x4a0 mm/swap.c:523
zap_present_folio_ptes mm/memory.c:1657 [inline]
zap_present_ptes mm/memory.c:1730 [inline]
do_zap_pte_range mm/memory.c:1832 [inline]
zap_pte_range mm/memory.c:1934 [inline]
zap_pmd_range mm/memory.c:2020 [inline]
zap_pud_range mm/memory.c:2048 [inline]
zap_p4d_range mm/memory.c:2069 [inline]
__zap_vma_range+0x1d69/0x49e0 mm/memory.c:2109
unmap_vmas+0x390/0x550 mm/memory.c:2178
exit_mmap+0x293/0x9f0 mm/mmap.c:1300
__mmput+0xcb/0x3d0 kernel/fork.c:1187
exit_mm+0x186/0x240 kernel/exit.c:610
do_exit+0x6cd/0x2360 kernel/exit.c:992
do_group_exit+0x22d/0x2f0 kernel/exit.c:1147
__do_sys_exit_group kernel/exit.c:1158 [inline]
__se_sys_exit_group kernel/exit.c:1156 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1156
x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ba3bbde59
Code: Unable to access opcode bytes at 0x7f9ba3bbde2f.
RSP: 002b:00007ffca26800e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ba3bbde59
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffca268014c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000016
R13: 00000000000927c0 R14: 0000000000052746 R15: 00007ffca26801a0