INFO: task syz-executor:4260 blocked for more than 143 seconds.
Not tainted 6.1.135-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D
stack:22240 pid:4260 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
wb_wait_for_completion+0x162/0x280 fs/fs-writeback.c:191
sync_inodes_sb+0x1b8/0x9e0 fs/fs-writeback.c:2739
sync_filesystem+0x16d/0x220 fs/sync.c:64
generic_shutdown_super+0x6b/0x340 fs/super.c:474
kill_block_super+0x7c/0xe0 fs/super.c:1470
deactivate_locked_super+0x93/0xf0 fs/super.c:332
cleanup_mnt+0x463/0x4f0 fs/namespace.c:1186
task_work_run+0x1ca/0x250 kernel/task_work.c:203
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f856d98fc97
RSP: 002b:00007ffed8c2fe78 EFLAGS: 00000246
ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f856da1089d RCX: 00007f856d98fc97
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffed8c2ff30
RBP: 00007ffed8c2ff30 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffed8c30fc0
R13: 00007f856da1089d R14: 000000000008c7c2 R15: 00007ffed8c31000
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c92b370 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0:
ffffffff8c92bb90
(
rcu_tasks_trace.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517
3 locks held by kworker/1:1/26:
#0:
ffff88814d387d38
(
(wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1:
ffffc90000a1fd00
(
(work_completion)(&(&ifa->dad_work)->work)
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#2:
ffffffff8db33868
(
rtnl_mutex
){+.+.}-{3:3}
, at: addrconf_dad_work+0xc4/0x14d0 net/ipv6/addrconf.c:4134
1 lock held by khungtaskd/28:
#0: ffffffff8c92a9e0
(
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513
5 locks held by kworker/u4:2/33:
3 locks held by kworker/u4:3/51:
#0: ffff888017479138
(
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1: ffffc90000bc7d00
(
(linkwatch_work).work
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#2: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263
3 locks held by kworker/0:2/125:
#0: ffff888017470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1: ffffc90002d87d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#2: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:104
4 locks held by udevd/3622:
#0:
ffff8880649c30a0
(
&p->lock
){+.+.}-{3:3}
, at: seq_read_iter+0xad/0xd50 fs/seq_file.c:182
#1:
ffff888059682c88
(
&of->mutex
){+.+.}-{3:3}, at: kernfs_seq_start+0x51/0x3b0 fs/kernfs/file.c:154
#2: ffff888064386bd0 (kn->active#5){++++}-{0:0}, at: kernfs_seq_start+0x71/0x3b0 fs/kernfs/file.c:155
#3: ffff888055c020e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline]
#3: ffff888055c020e8 (&dev->mutex){....}-{3:3}, at: uevent_show+0x16c/0x320 drivers/base/core.c:2669
2 locks held by dhcpcd/3915:
#0: ffffffff8db19a08 (vlan_ioctl_mutex){+.+.}-{3:3}, at: sock_ioctl+0x273/0x6e0 net/socket.c:1283
#1: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: vlan_ioctl_handler+0xd2/0x5f0 net/8021q/vlan.c:554
2 locks held by getty/4008:
#0: ffff88802fa3f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41b/0x1380 drivers/tty/n_tty.c:2198
2 locks held by syz-executor/4260:
#0: ffff88801ebea0e0 (&type->s_umount_key#97){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362
#1: ffff888143b6e7d0
(
&bdi->wb_switch_rwsem
){+.+.}-{3:3}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
, at: sync_inodes_sb+0x19c/0x9e0 fs/fs-writeback.c:2737
2 locks held by kworker/1:7/4302:
#0:
ffff888017472138
(
(wq_completion)rcu_gp
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1:
ffffc90004187d00
(
(work_completion)(&rew->rew_work)
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
2 locks held by kworker/u4:7/4340:
#0: ffff888143ab2138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1: ffffc90004577d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
3 locks held by kworker/u4:9/4363:
5 locks held by kworker/u4:12/4456:
#0: ffff888017616938 ((wq_completion)netns
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1:
ffffc900048bfd00
(
net_cleanup_work
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#2:
ffffffff8db26c10
(
pernet_ops_rwsem
){++++}-{3:3}
, at: cleanup_net+0x132/0xb80 net/core/net_namespace.c:594
#3:
ffffffff8db33868
(
rtnl_mutex
){+.+.}-{3:3}
, at: default_device_exit_batch+0xe5/0xa50 net/core/dev.c:11477
#4:
ffffffff8c9306b8
(
rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
, at: synchronize_rcu_expedited+0x455/0x830 kernel/rcu/tree_exp.h:962
3 locks held by kworker/0:8/5433:
#0:
ffff88814d387d38
(
(wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#1:
ffffc90003227d00
(
(work_completion)(&(&ifa->dad_work)->work)
){+.+.}-{0:0}
, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267
#2:
ffffffff8db33868
(
rtnl_mutex
){+.+.}-{3:3}
, at: addrconf_dad_work+0xc4/0x14d0 net/ipv6/addrconf.c:4134
4 locks held by segctord/11107:
1 lock held by syz.2.1437/11340:
#0:
ffff88801ebea0e0
(
&type->s_umount_key
#97
){++++}-{3:3}
, at: iterate_supers+0xa4/0x1d0 fs/super.c:755
1 lock held by syz-executor/11502:
#0: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x740/0xed0 net/core/rtnetlink.c:6150
1 lock held by syz-executor/11504:
#0: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x740/0xed0 net/core/rtnetlink.c:6150
4 locks held by syz-executor/11619:
#0: ffff88807f14e460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x256/0x960 fs/read_write.c:580
#1: ffff88805727fc88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1e5/0x4c0 fs/kernfs/file.c:325
#2: ffff8880268c5a00 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x208/0x4c0 fs/kernfs/file.c:326
#3: ffffffff8d44d508 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x129/0x670 drivers/net/netdevsim/bus.c:160
7 locks held by syz-executor/11633:
#0: ffff88807f14e460 (sb_writers#8){.+.+}-{0:0}
, at: vfs_write+0x256/0x960 fs/read_write.c:580
#1:
ffff88805722a488
(&of->mutex
){+.+.}-{3:3}
, at: kernfs_fop_write_iter+0x1e5/0x4c0 fs/kernfs/file.c:325
#2:
ffff8880268c5a00
(
kn->active
#51
){.+.+}-{0:0}
, at: kernfs_fop_write_iter+0x208/0x4c0 fs/kernfs/file.c:326
#3:
ffffffff8d44d508
(
nsim_bus_dev_list_lock
){+.+.}-{3:3}
, at: new_device_store+0x129/0x670 drivers/net/netdevsim/bus.c:160
#4:
ffff888055c020e8
(
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:837 [inline]
, at: __device_attach+0x85/0x460 drivers/base/dd.c:990
#5:
ffff888028ede2f8
(
&devlink->lock_key
#12
){+.+.}-{3:3}
, at: nsim_drv_probe+0xc0/0xaf0 drivers/net/netdevsim/dev.c:1542
#6:
ffffffff8db33868
(
rtnl_mutex
){+.+.}-{3:3}
, at: register_nexthop_notifier+0x7d/0x210 net/ipv4/nexthop.c:3606
1 lock held by syz-executor/11710:
#0:
ffffffff8db33868
(
rtnl_mutex
){+.+.}-{3:3}
, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
, at: rtnetlink_rcv_msg+0x740/0xed0 net/core/rtnetlink.c:6150
1 lock held by syz-executor/11746:
#0: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x740/0xed0 net/core/rtnetlink.c:6150
1 lock held by syz-executor/11749:
#0: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffffffff8db33868 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x740/0xed0 net/core/rtnetlink.c:6150
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.135-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3f4/0x470 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xeee/0xf30 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11107 Comm: segctord Not tainted 6.1.135-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:io_serial_in+0x73/0xb0 drivers/tty/serial/8250/8250_port.c:461
Code: e8 32 34 09 fd 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 43 a2 5a fd 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 44 89 f9 80 e1 07 38 c1 7c aa 4c
RSP: 0018:ffffc90003686d58 EFLAGS: 00000006
RAX: 1ffffffff2da8b05 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc90003686f50 R08: 0000000000000004 R09: 0000000000000003
R10: fffff520006d0d8c R11: 1ffff920006d0d8c R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff96d45820 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5f7a2e5000 CR3: 000000007f6ac000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_port_in include/linux/serial_core.h:668 [inline]
serial8250_console_write+0x247/0x17a0 drivers/tty/serial/8250/8250_port.c:3438
call_console_driver kernel/printk/printk.c:1977 [inline]
console_emit_next_record+0x947/0xc90 kernel/printk/printk.c:2777
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x223/0x630 kernel/printk/printk.c:2906
vprintk_emit+0x489/0x680 kernel/printk/printk.c:2303
_printk+0xcc/0x110 kernel/printk/printk.c:2328
show_trace_log_lvl+0x4d0/0x550 arch/x86/kernel/dumpstack.c:284
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
__getblk_slow fs/buffer.c:1026 [inline]
__getblk_gfp+0x1c3/0xb20 fs/buffer.c:1333
sb_getblk include/linux/buffer_head.h:356 [inline]
nilfs_segbuf_extend_segsum+0xcb/0x360 fs/nilfs2/segbuf.c:99
nilfs_segbuf_reset+0x33/0x140 fs/nilfs2/segbuf.c:135
nilfs_segctor_reset_segment_buffer fs/nilfs2/segment.c:421 [inline]
nilfs_segctor_collect fs/nilfs2/segment.c:1530 [inline]
nilfs_segctor_do_construct+0x12e4/0x6810 fs/nilfs2/segment.c:2090
nilfs_segctor_construct+0x17b/0x690 fs/nilfs2/segment.c:2453
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2561 [inline]
nilfs_segctor_thread+0x4f2/0xff0 fs/nilfs2/segment.c:2645
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295