INFO: task syslogd:5178 blocked for more than 143 seconds.
Not tainted 6.14.0-rc6-syzkaller-00003-g4d872d51bc9d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syslogd state:D stack:24240 pid:5178 tgid:5178 ppid:1 task_flags:0x400000 flags:0x00000002
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
___down_common+0x2d7/0x460 kernel/locking/semaphore.c:225
__down_common kernel/locking/semaphore.c:246 [inline]
__down+0x20/0x30 kernel/locking/semaphore.c:254
down+0x74/0xa0 kernel/locking/semaphore.c:63
console_lock+0x5b/0xa0 kernel/printk/printk.c:2833
console_device+0x19/0x180 kernel/printk/printk.c:3482
tty_lookup_driver+0x2fb/0x510 drivers/tty/tty_io.c:1930
tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
tty_open+0x54e/0xf80 drivers/tty/tty_io.c:2129
chrdev_open+0x237/0x6a0 fs/char_dev.c:414
do_dentry_open+0x735/0x1c40 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3830 [inline]
path_openat+0x1e88/0x2d80 fs/namei.c:3989
do_filp_open+0x20c/0x470 fs/namei.c:4016
do_sys_openat2+0x17a/0x1e0 fs/open.c:1428
do_sys_open fs/open.c:1443 [inline]
__do_sys_openat fs/open.c:1459 [inline]
__se_sys_openat fs/open.c:1454 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1454
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: 0033:0x7f546d1299a4
RSP: 002b:00007ffd7bfa9680 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f546d1299a4
RDX: 0000000000000901 RSI: 00007f546d2c83b3 RDI: 00000000ffffff9c
RBP: 00007f546d2c83b3 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000901
R13: 0000000000000901 R14: 0000000000000901 R15: 000055d5dc84e410
Showing all locks held in the system:
2 locks held by kworker/0:1/10:
3 locks held by kworker/u8:0/12:
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/u8:2/36:
3 locks held by kworker/u8:4/67:
#0: ffff88801b081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc90001577d18 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffffffff8fef7f68 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:285
3 locks held by kworker/u8:8/3920:
1 lock held by syslogd/5178:
#0: ffffffff8ee88828 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2046 [inline]
#0: ffffffff8ee88828 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x53d/0xf80 drivers/tty/tty_io.c:2129
1 lock held by udevd/5196:
2 locks held by dhcpcd/5489:
2 locks held by getty/5572:
#0: ffff88803267b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000330b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5818:
#0: ffff888031634d88 (&xt[i].mutex){+.+.}-{4:4}, at: xt_find_target+0xab/0x290 net/netfilter/x_tables.c:254
1 lock held by syz-executor/5819:
2 locks held by syz-executor/5831:
4 locks held by kworker/1:6/5868:
2 locks held by syz.4.6595/19927:
6 locks held by syz.2.6624/19992:
5 locks held by kworker/u8:5/19999:
2 locks held by kworker/u8:6/20000:
3 locks held by kworker/0:0/20001:
3 locks held by kworker/u8:10/20006:
3 locks held by syz-executor/20010:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc6-syzkaller-00003-g4d872d51bc9d #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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 19999 Comm: kworker/u8:5 Not tainted 6.14.0-rc6-syzkaller-00003-g4d872d51bc9d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: bat_events batadv_tt_purge
RIP: 0010:br_handle_frame+0x338/0x14a0 net/bridge/br_input.c:353
Code: 85 db 0f 85 15 08 00 00 e8 85 cd 90 f7 48 8b 04 24 48 8d 78 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 bd 0f 00 00 48 8b 04 24 31 ff 48 8b 40 28 48 89 c3 48 89 44
RSP: 0018:ffffc90000007870 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff8a292b80
RDX: 1ffff11004ab8e05 RSI: ffffffff8a29235b RDI: ffff8880255c7028
RBP: ffff88816d697c80 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000002 R12: ffff888021f28002
R13: 00000000aaaaaaaa R14: ffffc90000007a68 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8a11377d38 CR3: 000000007d68a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__netif_receive_skb_core.constprop.0+0xa20/0x4330 net/core/dev.c:5787
__netif_receive_skb_one_core+0xb1/0x1e0 net/core/dev.c:5891
__netif_receive_skb+0x1d/0x160 net/core/dev.c:6006
process_backlog+0x443/0x15f0 net/core/dev.c:6354
__napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:7188
napi_poll net/core/dev.c:7257 [inline]
net_rx_action+0xa94/0x1010 net/core/dev.c:7379
handle_softirqs+0x213/0x8f0 kernel/softirq.c:561
do_softirq kernel/softirq.c:462 [inline]
do_softirq+0xb2/0xf0 kernel/softirq.c:449
__local_bh_enable_ip+0x100/0x120 kernel/softirq.c:389
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_tt_local_purge+0x21c/0x3c0 net/batman-adv/translation-table.c:1315
batadv_tt_purge+0x86/0xb90 net/batman-adv/translation-table.c:3509
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
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