INFO: task syz.4.720:7965 blocked for more than 146 seconds.
Not tainted 6.12.0-rc3-next-20241016-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.720 state:D stack:24064 pid:7965 tgid:7964 ppid:7550 flags:0x00024000
Call Trace:
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x18af/0x4bd0 kernel/sched/core.c:6690
__schedule_loop kernel/sched/core.c:6767 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6782
schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
io_wq_exit_workers io_uring/io-wq.c:1249 [inline]
io_wq_put_and_exit+0x344/0x720 io_uring/io-wq.c:1277
io_uring_clean_tctx+0x168/0x1e0 io_uring/tctx.c:193
io_uring_cancel_generic+0x76a/0x820 io_uring/io_uring.c:3222
io_uring_files_cancel include/linux/io_uring.h:20 [inline]
do_exit+0x6a8/0x28e0 kernel/exit.c:894
do_group_exit+0x207/0x2c0 kernel/exit.c:1087
get_signal+0x16a3/0x1740 kernel/signal.c:2917
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe8ef37dff9
RSP: 002b:00007fe8eedff0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fe8ef535f88 RCX: 00007fe8ef37dff9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe8ef535f88
RBP: 00007fe8ef535f80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe8ef535f8c
R13: 0000000000000000 R14: 00007ffc1cfbf600 R15: 00007ffc1cfbf6e8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e939e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e939e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e939e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
3 locks held by kworker/u8:5/75:
#0: ffff88802e267948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88802e267948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc900022cfd00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc900022cfd00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fcdca48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4736
2 locks held by getty/4991:
#0: ffff88814c1eb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by dhcpcd/5033:
1 lock held by syz-executor/5222:
1 lock held by syz-executor/5705:
3 locks held by kworker/u8:13/7593:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc90003dbfd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90003dbfd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fcdca48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
5 locks held by kworker/u8:20/7600:
#0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc90003b4fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90003b4fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fccfed0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:587
#3: ffffffff8fcdca48 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe9/0xaa0 net/core/dev.c:12010
#4: ffffffff8e93f3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
#4: ffffffff8e93f3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
2 locks held by kworker/u8:24/7606:
1 lock held by iou-wrk-7965/7966:
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:249 [inline]
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd0b/0x1010 io_uring/kbuf.c:580
1 lock held by iou-wrk-7965/7969:
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:249 [inline]
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd0b/0x1010 io_uring/kbuf.c:580
1 lock held by iou-wrk-7965/7971:
1 lock held by iou-wrk-7965/7973:
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:249 [inline]
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd0b/0x1010 io_uring/kbuf.c:580
1 lock held by iou-wrk-7965/7974:
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:249 [inline]
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd0b/0x1010 io_uring/kbuf.c:580
1 lock held by iou-wrk-7965/7977:
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:249 [inline]
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd0b/0x1010 io_uring/kbuf.c:580
1 lock held by iou-wrk-7965/7979:
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_ring_submit_lock io_uring/io_uring.h:249 [inline]
#0: ffff888068dc60a8 (&ctx->uring_lock){+.+.}-{3:3}, at: io_provide_buffers+0xd0b/0x1010 io_uring/kbuf.c:580
4 locks held by syz-executor/8755:
1 lock held by syz.2.1063/9183:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-next-20241016-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xff4/0x1040 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8755 Comm: syz-executor Not tainted 6.12.0-rc3-next-20241016-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
RIP: 0010:page_expected_state mm/page_alloc.c:862 [inline]
RIP: 0010:check_new_page mm/page_alloc.c:1431 [inline]
RIP: 0010:check_new_pages mm/page_alloc.c:1445 [inline]
RIP: 0010:__rmqueue_pcplist+0x2308/0x2730 mm/page_alloc.c:3031
Code: 4d 40 48 89 c8 48 89 4c 24 30 48 39 8c 24 28 01 00 00 0f 84 81 03 00 00 4b 8d 6c 2c 28 48 89 ef be 04 00 00 00 e8 b8 74 0e 00 <48> 89 e8 48 89 6c 24 38 48 c1 ed 03 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc9000a5173d8 EFLAGS: 00000056
RAX: 0000000000000001 RBX: ffffea0000d01300 RCX: ffffffff81f04ea8
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea0000d01330
RBP: ffffea0000d01330 R08: ffffea0000d01333 R09: 1ffffd40001a0266
R10: dffffc0000000000 R11: fffff940001a0267 R12: ffffea0000d01308
R13: 0000000000000000 R14: ffff8880b8744760 R15: ffff8880b8744740
FS: 000055558011b500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f65126ee040 CR3: 00000000474a0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rmqueue_pcplist mm/page_alloc.c:3061 [inline]
rmqueue mm/page_alloc.c:3092 [inline]
get_page_from_freelist+0x86f/0x3270 mm/page_alloc.c:3490
__alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4769
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
alloc_slab_page+0x6a/0x120 mm/slub.c:2399
allocate_slab+0x5a/0x2f0 mm/slub.c:2565
new_slab mm/slub.c:2618 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3805
__slab_alloc+0x58/0xa0 mm/slub.c:3895
__slab_alloc_node mm/slub.c:3970 [inline]
slab_alloc_node mm/slub.c:4131 [inline]
kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4150
__sigqueue_alloc+0x42e/0x540 kernel/signal.c:428
__send_signal_locked+0x22f/0xdc0 kernel/signal.c:1117
do_send_sig_info kernel/signal.c:1299 [inline]
group_send_sig_info+0x292/0x310 kernel/signal.c:1449
bpf_send_signal_common+0x2dd/0x430 kernel/trace/bpf_trace.c:857
____bpf_send_signal kernel/trace/bpf_trace.c:862 [inline]
bpf_send_signal+0x19/0x30 kernel/trace/bpf_trace.c:860
bpf_prog_7ba5217f62dcd359+0x41/0x45
bpf_dispatcher_nop_func include/linux/bpf.h:1257 [inline]
__bpf_prog_run include/linux/filter.h:701 [inline]
bpf_prog_run include/linux/filter.h:708 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2318 [inline]
bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2359
__bpf_trace_sys_enter+0x38/0x60 include/trace/events/syscalls.h:18
trace_sys_enter+0xd9/0x150 include/trace/events/syscalls.h:18
syscall_trace_enter+0xf8/0x150 kernel/entry/common.c:61
syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline]
syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline]
do_syscall_64+0xcc/0x230 arch/x86/entry/common.c:79
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0d3ad19959
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007fffaf7128c0 EFLAGS: 00000293 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 000000000000003a RCX: 00007f0d3ad19959
RDX: 00007fffaf7128c0 RSI: 00007fffaf7129f0 RDI: 0000000000000011
RBP: 00007fffaf712eac R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000003cde6 R14: 000000000003cd91 R15: 00007fffaf712f00