INFO: task syz.0.1293:10721 blocked for more than 143 seconds.
Not tainted 6.16.0-rc3-syzkaller-00190-g67a993863163 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1293 state:D stack:24520 pid:10721 tgid:10720 ppid:5825 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
io_schedule+0x81/0xe0 kernel/sched/core.c:7723
folio_wait_bit_common+0x6b0/0xb90 mm/filemap.c:1317
folio_wait_writeback+0xb0/0x100 mm/page-writeback.c:3126
__filemap_fdatawait_range+0x147/0x230 mm/filemap.c:539
filemap_fdatawait_keep_errors+0x31/0xd0 mm/filemap.c:633
wait_sb_inodes fs/fs-writeback.c:2714 [inline]
sync_inodes_sb+0x7a9/0xa10 fs/fs-writeback.c:2836
__iterate_supers+0x13d/0x250 fs/super.c:924
ksys_sync+0x94/0x150 fs/sync.c:102
__ia32_sys_sync+0xe/0x20 fs/sync.c:113
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f87a7f8e929
RSP: 002b:00007f87a8da6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f87a81b5fa0 RCX: 00007f87a7f8e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f87a81b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f87a81b5fa0 R15: 00007ffdd065c5e8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by getty/5585:
#0: ffff8880353920a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by kworker/1:5/5910:
#0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3321
#1: ffffc900050ffbc0 ((fqdir_free_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900050ffbc0 ((fqdir_free_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3321
#2: ffffffff8e144840 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570 kernel/rcu/tree.c:3786
3 locks held by syz.3.43/6101:
#0: ffff888027c6c428 (sb_writers#14){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3096 [inline]
#0: ffff888027c6c428 (sb_writers#14){.+.+}-{0:0}, at: vfs_writev+0x288/0x960 fs/read_write.c:1055
#1: ffff888057a00148 (&sb->s_type->i_mutex_key#20){++++}-{4:4}, at: netfs_start_io_write+0xd8/0x100 fs/netfs/locking.c:112
#2: ffff888057a00500 (&ctx->wb_lock){+.+.}-{4:4}, at: netfs_begin_writethrough+0x65/0x140 fs/netfs/write_issue.c:626
2 locks held by syz.0.1293/10721:
#0: ffff888027c6c0e0 (&type->s_umount_key#57){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff888027c6c0e0 (&type->s_umount_key#57){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
#1: ffff888027c6c950 (&s->s_sync_lock){+.+.}-{4:4}, at: wait_sb_inodes fs/fs-writeback.c:2653 [inline]
#1: ffff888027c6c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10 fs/fs-writeback.c:2836
2 locks held by syz.4.1404/11167:
#0: ffff888027c6c0e0 (&type->s_umount_key#57){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff888027c6c0e0 (&type->s_umount_key#57){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121
#1: ffff888027c6c950 (&s->s_sync_lock){+.+.}-{4:4}, at: wait_sb_inodes fs/fs-writeback.c:2653 [inline]
#1: ffff888027c6c950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x255/0xa10 fs/fs-writeback.c:2836
4 locks held by syz.1.1720/12259:
4 locks held by syz.7.1735/12298:
#0: ffffffff8f563b70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8f563988 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline]
#1: ffffffff8f563988 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
#1: ffffffff8f563988 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x10d/0x790 net/netlink/genetlink.c:1209
#2: ffff888027c67100 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
#2: ffff888027c67100 (&dev->mutex){....}-{4:4}, at: nfc_dev_up+0x3f/0x320 net/nfc/core.c:95
#3: ffff888053cf4350 (&ndev->req_lock){+.+.}-{4:4}, at: nci_open_device net/nfc/nci/core.c:478 [inline]
#3: ffff888053cf4350 (&ndev->req_lock){+.+.}-{4:4}, at: nci_dev_up+0xa3/0xd50 net/nfc/nci/core.c:632
2 locks held by syz.2.1736/12292:
#0: ffffffff8e194028 (tracepoints_mutex){+.+.}-{4:4}, at: tracepoint_probe_unregister+0x30/0x9b0 kernel/tracepoint.c:501
#1: ffffffff8e144978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline]
#1: ffffffff8e144978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730 kernel/rcu/tree_exp.h:998
1 lock held by dhcpcd/12299:
#0: ffff88807ef57408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
#0: ffff88807ef57408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release net/socket.c:646 [inline]
#0: ffff88807ef57408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1391
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc3-syzkaller-00190-g67a993863163 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
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: 3 Comm: pool_workqueue_ Not tainted 6.16.0-rc3-syzkaller-00190-g67a993863163 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:lockdep_hardirqs_off+0xab/0x110 kernel/locking/lockdep.c:4498
Code: 9e 98 0a 00 00 41 8b 86 88 0a 00 00 ff c0 41 89 86 88 0a 00 00 41 89 86 a4 0a 00 00 eb 17 48 c7 c7 00 f3 9b 8d e8 d5 17 00 00 <65> 8b 05 0e 25 3a 07 85 c0 74 80 65 48 8b 05 e2 e4 39 07 48 3b 44
RSP: 0018:ffffc90000a088a8 EFLAGS: 00000082
RAX: 0000000000000001 RBX: ffffffff8b626252 RCX: 90081dc4b4fd1500
RDX: 0000000000000000 RSI: ffffffff8d9bf300 RDI: ffffffff8be1bb80
RBP: ffffc90000a08968 R08: ffffc90000a0899f R09: 0000000000000000
R10: ffffc90000a08990 R11: fffff52000141134 R12: dffffc0000000000
R13: 000000010000d555 R14: 0000000000000a02 R15: 1ffff9200014111c
FS: 0000000000000000(0000) GS:ffff888125d84000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd92c181178 CR3: 0000000039e1c000 CR4: 00000000003526f0
Call Trace:
trace_hardirqs_off+0x12/0x40 kernel/trace/trace_preemptirq.c:104
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
_raw_spin_lock_irqsave+0x82/0xf0 kernel/locking/spinlock.c:162
debug_object_assert_init+0xb4/0x380 lib/debugobjects.c:1007
debug_timer_assert_init kernel/time/timer.c:803 [inline]
debug_assert_init kernel/time/timer.c:848 [inline]
__mod_timer+0x4a/0xf30 kernel/time/timer.c:1025
addrconf_mod_rs_timer+0x51/0xe0 net/ipv6/addrconf.c:329
addrconf_rs_timer+0x45e/0x670 net/ipv6/addrconf.c:4051
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x286/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_unregister_key+0x2c5/0x310 kernel/locking/lockdep.c:6619
Code: 65 48 8b 05 fd 79 fb 10 48 3b 44 24 10 0f 84 26 fe ff ff e8 6d 91 c1 09 e8 98 92 c1 09 41 f7 c7 00 02 00 00 74 bd fb 40 84 ed <75> bc eb cd 90 0f 0b 90 e9 19 ff ff ff 90 0f 0b 90 e9 2a ff ff ff
RSP: 0018:ffffc90000087c00 EFLAGS: 00000246
RAX: 90081dc4b4fd1500 RBX: ffff888024b59138 RCX: 90081dc4b4fd1500
RDX: ffffffff935d7358 RSI: ffffffff8d98231d RDI: ffffffff8be1bb80
RBP: ffff888024b59100 R08: 0000000000000000 R09: ffffffff81ab3048
R10: dffffc0000000000 R11: fffffbfff1f3fbff R12: 0000000000000000
R13: 0000000000001000 R14: 0000000000000000 R15: 0000000000000207
wq_unregister_lockdep kernel/workqueue.c:4818 [inline]
pwq_release_workfn+0x6d5/0x870 kernel/workqueue.c:5114
kthread_worker_fn+0x507/0xb60 kernel/kthread.c:1010
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245