INFO: task syz.0.2198:16080 blocked for more than 143 seconds.
Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2198 state:D stack:27936 pid:16080 tgid:16078 ppid:5834 task_flags:0x400640 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6857
schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:264
coredump_wait fs/coredump.c:419 [inline]
do_coredump+0x86f/0x4410 fs/coredump.c:576
get_signal+0x230b/0x26c0 kernel/signal.c:3021
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f23a3b8d169
RSP: 002b:00007f23a49270e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f23a3da6088 RCX: 00007f23a3b8d169
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f23a3da608c
RBP: 00007f23a3da6080 R08: 00007f23a4949000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f23a3da608c
R13: 0000000000000000 R14: 00007ffc70b82030 R15: 00007ffc70b82118
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746
3 locks held by kworker/u8:18/6070:
4 locks held by kworker/u8:20/6072:
#0: ffff88801bef6148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc9000b257d18 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffffffff8fee46d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xca/0xb30 net/core/net_namespace.c:606
#3: ffffffff8e1c85b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:334
2 locks held by kworker/u8:22/6967:
2 locks held by kworker/u8:28/7000:
#0: ffff888147ed3948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc90019b0fd18 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
1 lock held by syz-executor/13473:
#0: ffff8880b863ed58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline]
#0: ffff8880b863ed58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:591
2 locks held by getty/14836:
#0: ffff88814d9530a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900030c22f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
1 lock held by syz.0.2198/16079:
3 locks held by syz.5.2560/17640:
1 lock held by syz.3.2567/17676:
2 locks held by syz.4.2575/17707:
#0: ffffffff8fee46d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x286/0x5f0 net/core/net_namespace.c:512
#1: ffffffff8fefa3e8 (rtnl_mutex){+.+.}-{4:4}, at: setup_net+0x40b/0x860 net/core/net_namespace.c:384
2 locks held by syz.3.2577/17712:
#0: ffffffff8fee46d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x286/0x5f0 net/core/net_namespace.c:512
#1: ffffffff8fefa3e8 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x218/0x790 net/ipv4/ip_tunnel.c:1159
2 locks held by syz.3.2577/17715:
#0: ffffffff8fee46d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x286/0x5f0 net/core/net_namespace.c:512
#1: ffffffff8fefa3e8 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x218/0x790 net/ipv4/ip_tunnel.c:1159
1 lock held by syz.5.2579/17721:
#0: ffffffff8e1c8480 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x700 kernel/rcu/tree.c:3741
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0xf62/0x12b0 kernel/hung_task.c:399
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
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: 0 PID: 5824 Comm: syz-executor Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:vfs_read+0x1ea/0xbf0 fs/read_write.c:568
Code: ed 0f 84 fd 02 00 00 e8 f4 a4 8c ff 48 89 df 48 8b 4c 24 08 48 8b 54 24 10 48 8b 34 24 ff d5 0f 1f 00 49 89 c5 e8 d6 a4 8c ff <31> ff 4c 89 ee e8 fc 9f 8c ff 4d 85 ed 0f 8f 8e 00 00 00 e8 be a4
RSP: 0018:ffffc900040afd30 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff888031cf21c0 RCX: ffffffff822d55f8
RDX: ffff888033c55a00 RSI: ffffffff822d4d7a RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: fffffffffffffdef
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff92000815faf
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000555562fd9500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f91bed78ab8 CR3: 000000003039c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ksys_read+0x207/0x250 fs/read_write.c:708
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f70dd58bb3d
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 01 1a 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:00007ffe33f8ad78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f70dd58bb3d
RDX: 0000000000000004 RSI: 00007ffe33f8ad8c RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000002f6be R09: 00007f70de356000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe33f8b1a0
R13: 0000000000000004 R14: 00007ffe33f8ad8c R15: 00007ffe33f8ae20