INFO: task syz.2.1518:11296 blocked for more than 143 seconds.
Not tainted 6.16.0-rc4-syzkaller-00123-g4c06e63b9203 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1518 state:D stack:25096 pid:11296 tgid:11296 ppid:5832 task_flags:0x400040 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
request_wait_answer fs/fuse/dev.c:565 [inline]
__fuse_request_send fs/fuse/dev.c:579 [inline]
__fuse_simple_request+0xf15/0x18d0 fs/fuse/dev.c:673
fuse_simple_request fs/fuse/fuse_i.h:1237 [inline]
fuse_flush+0x5d4/0x800 fs/fuse/file.c:475
filp_flush+0xbd/0x190 fs/open.c:1549
filp_close+0x1d/0x40 fs/open.c:1562
__range_close fs/file.c:752 [inline]
__do_sys_close_range fs/file.c:811 [inline]
__se_sys_close_range+0x359/0x650 fs/file.c:775
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb03598e929
RSP: 002b:00007ffdc3225be8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00000000000a30ed RCX: 00007fb03598e929
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb035bb7ba0 R08: 0000000000000001 R09: 0000000cc3225edf
R10: 00007fb035800000 R11: 0000000000000246 R12: 00007fb035bb5fac
R13: 00007fb035bb5fa0 R14: ffffffffffffffff R15: 00007ffdc3225d00
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13ee20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by getty/5594:
#0: ffff888030d4f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by syz.3.1922/12869:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc4-syzkaller-00123-g4c06e63b9203 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5822 Comm: syz-executor Not tainted 6.16.0-rc4-syzkaller-00123-g4c06e63b9203 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:file_write_not_started include/linux/fs.h:1869 [inline]
RIP: 0010:fsnotify_file_area_perm include/linux/fsnotify.h:145 [inline]
RIP: 0010:rw_verify_area+0x157/0x650 fs/read_write.c:477
Code: 80 3c 18 00 74 08 4c 89 e7 e8 a5 0e f0 ff 4d 8b 24 24 4c 89 e0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 60 04 00 00 41 0f bf 1c 24 <0f> b7 f3 bf 00 90 00 00 e8 0c ba 8e ff 81 fb 00 90 ff ff 7d 59 49
RSP: 0018:ffffc90003e0fc58 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00000000ffffc1ff RCX: 0000000000000000
RDX: ffff88803149da00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88802f5bbc03 R09: 1ffff11005eb7780
R10: dffffc0000000000 R11: ffffed1005eb7781 R12: ffff8880541f4ec0
R13: ffff888032584fc0 R14: 0000000000000004 R15: 0000000000000000
FS: 0000555557d26500(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c452329 CR3: 0000000051e30000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000000e DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
vfs_read+0x154/0x980 fs/read_write.c:563
ksys_read+0x145/0x250 fs/read_write.c:715
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6b2278d2fd
Code: a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b5 e8 a8 48 00 00 0f 1f 84 00 00 00 00 00 80 3d 41 92 1f 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
RSP: 002b:00007fff9a517108 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6b2278d2fd
RDX: 0000000000000004 RSI: 00007fff9a51711c RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000fd91daa R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff9a517530
R13: 0000000000000004 R14: 00007fff9a51711c R15: 00007fff9a5171b0