INFO: task syz.5.203:7469 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.203 state:D stack:25640 pid:7469 tgid:7468 ppid:5990 task_flags:0x400140 flags:0x00080006
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]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7607
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
__rt_mutex_slowlock_locked+0x1f84/0x25b0 kernel/locking/rtmutex.c:1787
__rwbase_read_lock+0xc3/0x180 kernel/locking/rwbase_rt.c:114
rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
__down_read kernel/locking/rwsem.c:1502 [inline]
down_read+0x132/0x200 kernel/locking/rwsem.c:1576
filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
do_page_cache_ra mm/readahead.c:347 [inline]
page_cache_ra_order+0x2b1/0x4a0 mm/readahead.c:558
filemap_get_pages+0x493/0x1e80 mm/filemap.c:2704
filemap_splice_read+0x621/0xd70 mm/filemap.c:3093
do_splice_read fs/splice.c:980 [inline]
splice_direct_to_actor+0x496/0xcc0 fs/splice.c:1084
do_splice_direct_actor fs/splice.c:1202 [inline]
do_splice_direct+0x19b/0x2a0 fs/splice.c:1228
do_sendfile+0x540/0x7e0 fs/read_write.c:1371
__do_sys_sendfile64 fs/read_write.c:1432 [inline]
__se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1418
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: 0033:0x7fafde20de99
RSP: 002b:00007fafdc466028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fafde495fa0 RCX: 00007fafde20de99
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 00007fafde2a3eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe85 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fafde496038 R14: 00007fafde495fa0 R15: 00007fff82e7b3c8
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:6/148:
#0: ffff88813ff5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88813ff5c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc9000395fc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc9000395fc40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
12 locks held by kworker/u8:8/197:
2 locks held by kworker/u8:11/1311:
#0: ffff88801f7f2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88801f7f2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90006487c40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90006487c40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
2 locks held by getty/5356:
#0: ffff8880358230a0 (&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
3 locks held by syz.7.191/7374:
1 lock held by syz.5.203/7469:
#0: ffff888026e5da98 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#0: ffff888026e5da98 (mapping.invalidate_lock){++++}-{4:4}, at: do_page_cache_ra mm/readahead.c:347 [inline]
#0: ffff888026e5da98 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x2b1/0x4a0 mm/readahead.c:558
1 lock held by syz.9.281/8185:
#0: ffff888026e5da98 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#0: ffff888026e5da98 (mapping.invalidate_lock){++++}-{4:4}, at: do_page_cache_ra mm/readahead.c:347 [inline]
#0: ffff888026e5da98 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x2b1/0x4a0 mm/readahead.c:558
1 lock held by syz.0.339/8675:
#0: ffff888026e5da98 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline]
#0: ffff888026e5da98 (mapping.invalidate_lock){++++}-{4:4}, at: do_page_cache_ra mm/readahead.c:347 [inline]
#0: ffff888026e5da98 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x2b1/0x4a0 mm/readahead.c:558
1 lock held by syz.0.339/8676:
#0: ffff888026e5d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline]
#0: ffff888026e5d8c8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x2e6/0x430 block/fops.c:829
7 locks held by kworker/u8:7/8777:
1 lock held by syz-executor/9186:
4 locks held by syz.1.403/9210:
3 locks held by syz.3.406/9224:
1 lock held by udevadm/9243:
1 lock held by sed/9246:
1 lock held by syz.2.407/9249:
1 lock held by modprobe/9250:
=============================================
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 05/09/2026
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: 197 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:__bfs kernel/locking/lockdep.c:1753 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3908 [inline]
RIP: 0010:__lock_acquire+0x17a5/0x2ce0 kernel/locking/lockdep.c:5237
Code: 00 00 0f 83 84 01 00 00 4e 8b 3c e5 a0 e9 a5 95 ff c0 25 ff 0f 00 00 89 05 48 87 05 14 4d 85 ff 0f 84 ac 01 00 00 49 8b 47 10 <48> 85 c0 0f 84 38 0d 00 00 8b 0d 34 87 05 14 39 48 5c 0f 84 6a ff
RSP: 0018:ffffc90003b4e130 EFLAGS: 00000082
RAX: ffffffff934e4b78 RBX: 00000000000003cd RCX: ffffffff9644f908
RDX: ffffffff96361198 RSI: ffff8880207d2d10 RDI: 00000000000003cd
RBP: 45f2d100305a31c2 R08: ffffc90003b4e0f8 R09: 0000000000000020
R10: 0000000000000000 R11: ffffffff81a13580 R12: 0000000000000575
R13: ffff8880207d2d10 R14: ffff8880207d1f00 R15: ffffffff9644f908
FS: 0000000000000000(0000) GS:ffff888125d45000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9658968a10 CR3: 000000003abfe000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
seqcount_lockdep_reader_access+0x55/0x100 include/linux/seqlock.h:73
ktime_get+0x45/0x220 kernel/time/timekeeping.c:971
hrtick_start+0x99/0x250 kernel/sched/core.c:980
enqueue_task+0x75/0x410 kernel/sched/core.c:2184
sched_change_end+0x213/0x600 kernel/sched/core.c:11255
migrate_disable_switch kernel/sched/core.c:2465 [inline]
__schedule+0x1879/0x5500 kernel/sched/core.c:7089
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7413
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
_raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:198
rt_mutex_slowtrylock kernel/locking/rtmutex.c:1408 [inline]
__rt_spin_trylock kernel/locking/spinlock_rt.c:123 [inline]
rt_spin_trylock+0xd2/0x2b0 kernel/locking/spinlock_rt.c:135
alloc_from_pcs mm/slub.c:4795 [inline]
slab_alloc_node mm/slub.c:4933 [inline]
__kmalloc_cache_noprof+0x182/0x6b0 mm/slub.c:5511
_kmalloc_noprof include/linux/slab.h:969 [inline]
_kzalloc_noprof include/linux/slab.h:1290 [inline]
ref_tracker_alloc+0x15e/0x4c0 lib/ref_tracker.c:270
__netdev_tracker_alloc include/linux/netdevice.h:4499 [inline]
netdev_hold include/linux/netdevice.h:4528 [inline]
dst_init+0xbe/0x470 net/core/dst.c:52
dst_alloc+0x12a/0x170 net/core/dst.c:94
ip6_dst_alloc net/ipv6/route.c:342 [inline]
ip6_rt_pcpu_alloc net/ipv6/route.c:1423 [inline]
rt6_make_pcpu_route net/ipv6/route.c:1472 [inline]
ip6_pol_route+0xba1/0x14d0 net/ipv6/route.c:2330
pol_lookup_func include/net/ip6_fib.h:669 [inline]
fib6_rule_lookup+0x556/0x730 net/ipv6/fib6_rules.c:123
ip6_route_input_lookup net/ipv6/route.c:2363 [inline]
ip6_route_input+0x78d/0xb20 net/ipv6/route.c:2666
ip6_rcv_finish+0x141/0x280 net/ipv6/ip6_input.c:117
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
__netif_receive_skb_one_core net/core/dev.c:6212 [inline]
__netif_receive_skb net/core/dev.c:6325 [inline]
process_backlog+0x3bf/0xc50 net/core/dev.c:6676
__napi_poll+0xae/0x550 net/core/dev.c:7735
napi_poll net/core/dev.c:7798 [inline]
net_rx_action+0x621/0xd70 net/core/dev.c:7955
handle_softirqs+0x1d9/0x6c0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
__local_bh_enable_ip+0x170/0x2b0 kernel/softirq.c:302
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:914 [inline]
__dev_queue_xmit+0x1ee9/0x3880 net/core/dev.c:4913
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x337/0x540 net/ipv6/ip6_output.c:246
dst_output include/net/dst.h:471 [inline]
NF_HOOK+0x177/0x4f0 include/linux/netfilter.h:318
mld_sendpack+0x890/0xe10 net/ipv6/mcast.c:1869
ipv6_mc_dad_complete+0x87/0x410 net/ipv6/mcast.c:2295
addrconf_dad_completed+0x622/0xe60 net/ipv6/addrconf.c:4375
addrconf_dad_work+0xdda/0x16e0 net/ipv6/addrconf.c:-1
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