INFO: task syz.4.74:6219 blocked for more than 155 seconds.
Not tainted 6.12.0-syzkaller-05480-gfcc79e1714e8 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.74 state:D stack:25144 pid:6219 tgid:6205 ppid:5851 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x1850/0x4c30 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6848
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
__mutex_lock_common kernel/locking/mutex.c:665 [inline]
__mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735
vmsplice_to_pipe fs/splice.c:1555 [inline]
__do_sys_vmsplice fs/splice.c:1613 [inline]
__se_sys_vmsplice+0x4be/0x1490 fs/splice.c:1583
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f75f737e819
RSP: 002b:00007f75f81e7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000116
RAX: ffffffffffffffda RBX: 00007f75f7536080 RCX: 00007f75f737e819
RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000006
RBP: 00007f75f73f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f75f7536080 R15: 00007fff27226268
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e93c860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
4 locks held by kworker/u8:4/62:
2 locks held by getty/5612:
#0: ffff8880319150a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fc62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5853:
1 lock held by syz.4.74/6205:
#0: ffff888011bb3c68 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x320 fs/pipe.c:727
1 lock held by syz.4.74/6206:
#0: ffff888011bb3c68 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x2e/0x500 fs/splice.c:1292
1 lock held by syz.4.74/6219:
#0: ffff888011bb3c68 (&pipe->mutex){+.+.}-{4:4}, at: vmsplice_to_pipe fs/splice.c:1555 [inline]
#0: ffff888011bb3c68 (&pipe->mutex){+.+.}-{4:4}, at: __do_sys_vmsplice fs/splice.c:1613 [inline]
#0: ffff888011bb3c68 (&pipe->mutex){+.+.}-{4:4}, at: __se_sys_vmsplice+0x4be/0x1490 fs/splice.c:1583
1 lock held by udevd/6287:
1 lock held by udevd/6295:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-syzkaller-05480-gfcc79e1714e8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
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:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xff4/0x1040 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 101 PID: 5666 Comm: dhcpcd Not tainted 6.12.0-syzkaller-05480-gfcc79e1714e8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:arch_exit_to_user_mode_prepare arch/x86/include/asm/entry-common.h:81 [inline]
RIP: 0010:exit_to_user_mode_prepare include/linux/entry-common.h:331 [inline]
RIP: 0010:__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
RIP: 0010:syscall_exit_to_user_mode+0x17d/0x340 kernel/entry/common.c:218
Code: 9d f7 c3 00 08 00 00 0f 85 a0 00 00 00 f7 c3 00 00 40 00 0f 85 a5 00 00 00 e8 ff 8e 67 f5 f7 c3 00 40 00 00 0f 85 d2 00 00 00 <41> 80 64 24 10 f9 0f 1f 44 00 00 83 3d c1 1d 72 0e 00 75 0f 41 83
RSP: 0018:ffffc90003e87ed8 EFLAGS: 00000046
RAX: ffffffff8136ab93 RBX: 0000000000000000 RCX: ffff88802f021e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc90003e87f48 R08: ffffffff8136ab8a R09: 1ffff11005e043c0
R10: dffffc0000000000 R11: ffffed1005e043c1 R12: ffff88802f021e00
R13: 0000000000000000 R14: ffffc90003e87f58 R15: ffffffffffffffff
FS: 00007f37047ff740(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056031737b680 CR3: 000000006298a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f37048ccad5
Code: 85 d2 74 0d 0f 10 02 48 8d 54 24 20 0f 11 44 24 20 64 8b 04 25 18 00 00 00 85 c0 75 27 41 b8 08 00 00 00 b8 0f 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 75 48 8b 15 24 73 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffef1017880 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 0000560347b05ee0 RCX: 00007f37048ccad5
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000560347b11c30
RBP: 00007ffef1017bd0 R08: 0000000000000008 R09: 0000000000000000
R10: 00007ffef1017bd0 R11: 0000000000000246 R12: 0000000000000000
R13: 000056031737a610 R14: 00000000ffffffff R15: 0000000000000000