INFO: task syz-executor:5802 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21096 pid:5802 tgid:5802 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1480/0x50a0 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
io_schedule+0x81/0xe0 kernel/sched/core.c:7789
folio_wait_bit_common+0x6b5/0xb90 mm/filemap.c:1323
__folio_lock mm/filemap.c:1699 [inline]
folio_lock include/linux/pagemap.h:1159 [inline]
__filemap_get_folio_mpol+0x16d/0xa50 mm/filemap.c:1954
__filemap_get_folio include/linux/pagemap.h:763 [inline]
truncate_inode_pages_range+0x3f3/0xd90 mm/truncate.c:413
evict+0x607/0xae0 fs/inode.c:839
dispose_list fs/inode.c:879 [inline]
evict_inodes+0x753/0x7e0 fs/inode.c:933
generic_shutdown_super+0x9a/0x2c0 fs/super.c:628
kill_block_super+0x44/0x90 fs/super.c:1722
deactivate_locked_super+0xbc/0x130 fs/super.c:474
cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318
task_work_run+0x1d4/0x260 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8d0fa20a77
RSP: 002b:00007fff3981efa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f8d0faa3d7d RCX: 00007f8d0fa20a77
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff3981f060
RBP: 00007fff3981f060 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff398200f0
R13: 00007f8d0faa3d7d R14: 0000000000025e8d R15: 00007fff39820130
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8d5ae880 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d5ae880 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8d5ae880 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by syslogd/5151:
2 locks held by getty/5558:
#0: ffff8880346780a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x44f/0x1460 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5802:
#0: ffff88805f5080d0 (&type->s_umount_key#107){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88805f5080d0 (&type->s_umount_key#107){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88805f5080d0 (&type->s_umount_key#107){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506
1 lock held by syz.2.335/7585:
#0: ffff88805f5080d0 (&type->s_umount_key#107){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff88805f5080d0 (&type->s_umount_key#107){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
1 lock held by syz.6.368/7797:
#0: ffff88805f5080d0 (&type->s_umount_key#107){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff88805f5080d0 (&type->s_umount_key#107){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
3 locks held by syz.1.390/7943:
1 lock held by syz-executor/7946:
2 locks held by syz-executor/7947:
=============================================
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 10/25/2025
Call Trace:
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]
__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:346 [inline]
watchdog+0xf95/0xfe0 kernel/hung_task.c:515
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5158 Comm: klogd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__migrate_enable include/linux/sched.h:2388 [inline]
RIP: 0010:migrate_enable include/linux/sched.h:2429 [inline]
RIP: 0010:rt_spin_unlock+0xc0/0x200 kernel/locking/spinlock_rt.c:81
Code: 00 00 0f 85 db 00 00 00 43 0f b6 04 3c 84 c0 0f 85 f5 00 00 00 66 41 c7 06 00 00 65 48 8b 05 8f ef db 06 4c 8d b0 a0 94 b3 91 <4c> 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e9 00 00 00 41 ff
RSP: 0018:ffffc90003b17a40 EFLAGS: 00000246
RAX: ffff888126e03000 RBX: ffff8880108cf6b0 RCX: ffffffff98bd0400
RDX: 000000005f479b93 RSI: ffffffff8cfe1b22 RDI: ffff8880350ac0e0
RBP: 0000000000000001 R08: ffffffff8ad5d5d1 R09: ffffffff8d5ae880
R10: 0000000000000000 R11: ffffed1002119b11 R12: 1ffff11006a15820
R13: ffff8880350abc80 R14: ffff8880b893c4a0 R15: dffffc0000000000
FS: 00007f41e2fd3c80(0000) GS:ffff888126e03000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6875071765 CR3: 000000003537a000 CR4: 00000000003526f0
Call Trace:
spin_unlock include/linux/spinlock_rt.h:105 [inline]
unix_peer_get+0xa6/0xe0 net/unix/af_unix.c:301
unix_dgram_sendmsg+0x77f/0x1840 net/unix/af_unix.c:2158
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:742
__sys_sendto+0x3c7/0x520 net/socket.c:2206
__do_sys_sendto net/socket.c:2213 [inline]
__se_sys_sendto net/socket.c:2209 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2209
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f41e3123407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc188b37b0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f41e2fd3c80 RCX: 00007f41e3123407
RDX: 0000000000000047 RSI: 00007ffc188b38f0 RDI: 0000000000000003
RBP: 00007ffc188b3d20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000202 R12: 00007ffc188b3d38
R13: 00007ffc188b38f0 R14: 000000000000002c R15: 00007ffc188b38f0