INFO: task syz.1.3238:18652 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.3238 state:D stack:26648 pid:18652 tgid:18650 ppid:14988 task_flags:0x400548 flags:0x00080004
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:121
io_wq_exit_workers io_uring/io-wq.c:1328 [inline]
io_wq_put_and_exit+0x271/0x8a0 io_uring/io-wq.c:1356
io_uring_clean_tctx+0x10d/0x190 io_uring/tctx.c:203
io_uring_cancel_generic+0x69c/0x9a0 io_uring/cancel.c:646
io_uring_files_cancel include/linux/io_uring.h:19 [inline]
do_exit+0x2ce/0x2bd0 kernel/exit.c:911
do_group_exit+0xd3/0x2a0 kernel/exit.c:1112
get_signal+0x2671/0x26d0 kernel/signal.c:3034
arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x8c/0x540 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+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f299a78f749
RSP: 002b:00007f299b53e0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f299a9e6098 RCX: 00007f299a78f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f299a9e6098
RBP: 00007f299a9e6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f299a9e6128 R14: 00007ffe41f7a290 R15: 00007ffe41f7a378
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e3c9620 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
2 locks held by getty/5573:
#0: ffff8880364cd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x1510 drivers/tty/n_tty.c:2211
4 locks held by iou-wrk-18652/18659:
1 lock held by syz-executor/18765:
#0: ffffffff8e3d4d78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x284/0x3c0 kernel/rcu/tree_exp.h:311
1 lock held by syz.3.3581/20113:
#0: ffffffff9012b2d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x333/0x7c0 net/core/net_namespace.c:577
1 lock held by syz.3.3581/20114:
#0: ffffffff9012b2d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x333/0x7c0 net/core/net_namespace.c:577
1 lock held by syz.2.3583/20119:
#0: ffff8880381ae988 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline]
#0: ffff8880381ae988 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: __sock_release+0x86/0x270 net/socket.c:661
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/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+0x133/0x180 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xe66/0x1180 kernel/hung_task.c:515
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 18659 Comm: iou-wrk-18652 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:native_read_msr_safe arch/x86/include/asm/msr.h:121 [inline]
RIP: 0010:__rdmsr_safe_on_cpu+0x3d/0x140 arch/x86/lib/msr-smp.c:156
Code: fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e f1 00 00 00 44 8b 23 44 89 e1 0f 32 <45> 31 ed 48 89 d5 49 89 c6 0f 1f 44 00 00 e8 70 df dc fc 48 c1 e5
RSP: 0018:ffffc9000263f720 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc9000263f800 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff84e206e4 RDI: ffffc9000263f800
RBP: ffffc9000263f7c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88804fb7aff0 R12: 0000000000000000
R13: ffffc9000263f800 R14: ffffc9000263f7c8 R15: 0000000000000000
FS: 00007f299b53e6c0(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000107000 CR3: 000000007b092000 CR4: 00000000003526f0
DR0: 0000000000800003 DR1: 00000000000001f5 DR2: 0000000000000483
DR3: 0000000000000007 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
csd_do_func kernel/smp.c:136 [inline]
generic_exec_single+0x1c7/0x390 kernel/smp.c:439
smp_call_function_single_async+0x68/0xd0 kernel/smp.c:732
rdmsr_safe_on_cpu+0x104/0x210 arch/x86/lib/msr-smp.c:179
msr_read+0x19d/0x250 arch/x86/kernel/msr.c:66
loop_rw_iter+0x2fa/0x690 io_uring/rw.c:722
io_iter_do_read io_uring/rw.c:829 [inline]
io_iter_do_read io_uring/rw.c:822 [inline]
__io_read+0x1055/0x14b0 io_uring/rw.c:943
io_read+0x8d/0x1f0 io_uring/rw.c:1023
__io_issue_sqe+0xe8/0x7c0 io_uring/io_uring.c:1792
io_issue_sqe+0x85/0x1410 io_uring/io_uring.c:1815
io_wq_submit_work+0x3b9/0xed0 io_uring/io_uring.c:1927
io_worker_handle_work+0x639/0x16f0 io_uring/io-wq.c:650
io_wq_worker+0x35f/0xdd0 io_uring/io-wq.c:704
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246