INFO: task syz.0.1299:10187 blocked for more than 143 seconds.
Not tainted 6.15.0-next-20250530-syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1299 state:D stack:25176 pid:10187 tgid:10185 ppid:5833 task_flags:0x400548 flags:0x00024000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_timeout+0x9a/0x270 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+0x2bf/0x5d0 kernel/sched/completion.c:148
io_wq_exit_workers io_uring/io-wq.c:1317 [inline]
io_wq_put_and_exit+0x31b/0x690 io_uring/io-wq.c:1345
io_uring_clean_tctx+0x11f/0x1a0 io_uring/tctx.c:203
io_uring_cancel_generic+0x68f/0x730 io_uring/io_uring.c:3204
io_uring_files_cancel include/linux/io_uring.h:19 [inline]
do_exit+0x345/0x22e0 kernel/exit.c:911
do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
get_signal+0x1286/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8f2b78e969
RSP: 002b:00007f8f2c5480e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f8f2b9b5fa8 RCX: 00007f8f2b78e969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f8f2b9b5fa8
RBP: 00007f8f2b9b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8f2b9b5fac
R13: 0000000000000000 R14: 00007ffed9281e70 R15: 00007ffed9281f58
Showing all locks held in the system:
2 locks held by ksoftirqd/0/15:
1 lock held by khungtaskd/31:
#0: ffffffff8e13f140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13f140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13f140 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by getty/5595:
#0: ffff8880306150a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by kworker/u8:10/5972:
#0: ffff8880b863b918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:614
#1: ffff8880b8623f08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x314/0x6d0 kernel/sched/psi.c:975
#2: ffff8880b8625958 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x8ee/0xf30 kernel/time/timer.c:1117
1 lock held by iou-wrk-10187/10193:
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:287 [inline]
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_manage_buffers_legacy+0xa33/0xc90 io_uring/kbuf.c:549
1 lock held by iou-wrk-10187/10195:
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:287 [inline]
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_manage_buffers_legacy+0xa33/0xc90 io_uring/kbuf.c:549
1 lock held by iou-wrk-10187/10197:
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:287 [inline]
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_manage_buffers_legacy+0xa33/0xc90 io_uring/kbuf.c:549
1 lock held by iou-wrk-10187/10199:
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:287 [inline]
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_manage_buffers_legacy+0xa33/0xc90 io_uring/kbuf.c:549
1 lock held by iou-wrk-10187/10200:
1 lock held by iou-wrk-10187/10202:
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:287 [inline]
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_manage_buffers_legacy+0xa33/0xc90 io_uring/kbuf.c:549
1 lock held by iou-wrk-10187/10203:
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:287 [inline]
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_manage_buffers_legacy+0xa33/0xc90 io_uring/kbuf.c:549
1 lock held by iou-wrk-10187/10204:
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:287 [inline]
#0: ffff888079fdc0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_manage_buffers_legacy+0xa33/0xc90 io_uring/kbuf.c:549
2 locks held by syz.5.1812/11849:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-next-20250530-syzkaller #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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6039 Comm: kworker/u8:12 Not tainted 6.15.0-next-20250530-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4873 [inline]
RIP: 0010:__lock_acquire+0x45c/0xd20 kernel/locking/lockdep.c:5190
Code: f9 ff bd ff ff ff ff 0f 4c e9 ff c5 45 8d 7c 24 01 49 ff cc 44 89 f9 83 c1 fe 78 44 44 89 e3 81 e3 ff ff ff 7f 83 f9 31 73 1d <48> 8d 0c 9b 8b 8c cf 10 0b 00 00 31 c1 41 ff cf 49 ff cc f7 c1 00
RSP: 0018:ffffc9000a8b78f0 EFLAGS: 00000097
RAX: 0000000000020007 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff88802e703c00
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8b33b452
R10: dffffc0000000000 R11: ffffffff8b33b380 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88802e704740 R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff888125c53000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6f6e77fab8 CR3: 000000000df38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xef/0x610 net/batman-adv/network-coding.c:719
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
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