INFO: task kworker/u8:2:43 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:2 state:D stack:21136 pid:43 tgid:43 ppid:2 task_flags:0x4248160 flags:0x00080000
Workqueue: xfs-cil/loop7 xlog_cil_push_work
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_timeout+0xc0/0x2c0 kernel/time/sleep_timeout.c:75
___down_common kernel/locking/semaphore.c:293 [inline]
__down_common+0x3b7/0x850 kernel/locking/semaphore.c:318
down+0x80/0xd0 kernel/locking/semaphore.c:100
xfs_buf_lock+0x153/0x4c0 fs/xfs/xfs_buf.c:932
xfs_buf_item_unpin+0x1bb/0x6c0 fs/xfs/xfs_buf_item.c:551
xlog_cil_ail_insert fs/xfs/xfs_log_cil.c:-1 [inline]
xlog_cil_committed+0x9c6/0x1110 fs/xfs/xfs_log_cil.c:995
xlog_cil_process_committed+0x154/0x1b0 fs/xfs/xfs_log_cil.c:1025
xlog_state_shutdown_callbacks+0x26d/0x370 fs/xfs/xfs_log.c:438
xlog_state_release_iclog+0x3fa/0x7f0 fs/xfs/xfs_log.c:501
xlog_cil_push_work+0x2459/0x2a90 fs/xfs/xfs_log_cil.c:1613
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz.7.465:9861 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.465 state:D stack:25488 pid:9861 tgid:9860 ppid:8878 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
schedule_timeout+0xc0/0x2c0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2ca/0x5e0 kernel/sched/completion.c:153
__flush_workqueue+0x709/0x1470 kernel/workqueue.c:4130
xlog_cil_push_now fs/xfs/xfs_log_cil.c:1725 [inline]
xlog_cil_force_seq+0x21a/0x880 fs/xfs/xfs_log_cil.c:1927
xfs_log_force_seq+0x196/0x440 fs/xfs/xfs_log.c:2984
__xfs_trans_commit+0x7f7/0xc20 fs/xfs/xfs_trans.c:877
xfs_trans_commit+0x13e/0x1c0 fs/xfs/xfs_trans.c:926
xfs_sync_sb_buf+0x13f/0x230 fs/xfs/libxfs/xfs_sb.c:1490
xfs_ioc_setlabel+0x1d7/0x340 fs/xfs/xfs_ioctl.c:1081
xfs_file_ioctl+0x901/0x1590 fs/xfs/xfs_ioctl.c:1238
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7365abe0d9
RSP: 002b:00007f7363d16028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7365d45fa0 RCX: 00007f7365abe0d9
RDX: 00002000000001c0 RSI: 0000000041009432 RDI: 0000000000000005
RBP: 00007f7365b55024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7365d46038 R14: 00007f7365d45fa0 R15: 00007ffd2ec29bc8
Showing all locks held in the system:
3 locks held by kworker/0:0/9:
#0: ffff88813ff1f938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88813ff1f938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc900000e7c40 (netdev_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc900000e7c40 (netdev_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffffffff8f5ac938 (rtnl_mutex){+.+.}-{4:4}, at: netdev_work_proc+0x72/0x7f0 net/core/netdev_work.c:132
3 locks held by kworker/u8:1/13:
#0: ffff888061f9f938 ((wq_completion)loop3){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff888061f9f938 ((wq_completion)loop3){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90000127c40 ((work_completion)(&worker->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90000127c40 ((work_completion)(&worker->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffff888026dc3160 (&lo->lo_work_lock){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock_rt.h:96 [inline]
#2: ffff888026dc3160 (&lo->lo_work_lock){+.+.}-{3:3}, at: loop_process_work+0x125/0x11d0 drivers/block/loop.c:1945
2 locks held by ktimers/1/29:
1 lock held by khungtaskd/38:
#0: ffffffff8e1c3040 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e1c3040 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e1c3040 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:2/43:
#0: ffff88806085a938 ((wq_completion)xfs-cil/loop7){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88806085a938 ((wq_completion)xfs-cil/loop7){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90000b47c40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90000b47c40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
3 locks held by kworker/u8:6/153:
#0: ffff88803265f938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88803265f938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc900038ffc40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc900038ffc40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffffffff8f5ac938 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8f5ac938 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x123/0x16e0 net/ipv6/addrconf.c:4229
2 locks held by kworker/1:2/998:
#0: ffff888060821d38 ((wq_completion)xfs-sync/loop7){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff888060821d38 ((wq_completion)xfs-sync/loop7){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90005db7c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90005db7c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
2 locks held by getty/5336:
#0: ffff8880360c40a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
1 lock held by syz.7.465/9861:
#0: ffff888032edc500 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x210 fs/namespace.c:538
2 locks held by syz-executor/11248:
1 lock held by syz-executor/11264:
#0: ffffffff8f5ac938 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8f5ac938 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8f5ac938 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a3/0x1bd0 net/core/rtnetlink.c:4158
4 locks held by udevd/11584:
#0: ffff888023749688 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline]
#0: ffff888023749688 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x2e6/0x430 block/fops.c:829
#1: ffff888023749858 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#1: ffff888023749858 (mapping.invalidate_lock){++++}-{4:4}, at: do_page_cache_ra mm/readahead.c:347 [inline]
#1: ffff888023749858 (mapping.invalidate_lock){++++}-{4:4}, at: force_page_cache_ra+0x261/0x2e0 mm/readahead.c:378
#2: ffffffff8e1c3040 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#2: ffffffff8e1c3040 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#2: ffffffff8e1c3040 (rcu_read_lock){....}-{1:3}, at: blk_mq_dispatch_queue_requests+0x55b/0x800 block/blk-mq.c:2877
#3: ffff888026dc3160 (&lo->lo_work_lock){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock_rt.h:96 [inline]
#3: ffff888026dc3160 (&lo->lo_work_lock){+.+.}-{3:3}, at: loop_queue_work drivers/block/loop.c:799 [inline]
#3: ffff888026dc3160 (&lo->lo_work_lock){+.+.}-{3:3}, at: loop_queue_rq+0x232/0xb50 drivers/block/loop.c:1881
6 locks held by syz.3.661/11806:
3 locks held by syz.1.663/11823:
3 locks held by syz.2.664/11840:
2 locks held by sed/11843:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11805 Comm: syz.3.661 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:restore_fpregs_from_fpstate+0x60/0x130 arch/x86/kernel/fpu/core.c:214
Code: 00 4c 23 35 7a 9d 46 0c 4d 89 f7 49 c1 ef 20 48 89 df 4c 89 f6 ba 01 00 00 00 e8 4b b6 00 00 44 89 f0 44 89 fa 48 0f ae 6b 40 <5b> 41 5c 41 5e 41 5f c3 cc cc cc cc cc e8 ee 24 59 00 eb b2 e8 e7
RSP: 0018:ffffc9000507fe78 EFLAGS: 00000092
RAX: 0000000000000007 RBX: ffff88801e317780 RCX: ffff88801e315d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1003c62ba1 R12: dffffc0000000000
R13: 1ffff11003c62ba5 R14: 0000000000000007 R15: 0000000000000000
FS: 000055557df6a500(0000) GS:ffff888125d3a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb0f2f51368 CR3: 0000000060d78000 CR4: 00000000003526f0
Call Trace:
fpregs_restore_userregs arch/x86/kernel/fpu/context.h:74 [inline]
switch_fpu_return+0x108/0x1e0 arch/x86/kernel/fpu/core.c:880
arch_exit_to_user_mode_prepare+0x97/0xa0 arch/x86/include/asm/entry-common.h:66
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:210 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x1f5/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f291888e90e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffd64885548 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 000055557df6a500 RCX: 00007f291888e90e
RDX: 00007ffd648855a0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f2918b57da0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000008cc56
R13: 00007f2918b5609c R14: 000000000008cc24 R15: 00007f2918b56090