INFO: task syz-executor.1:5061 blocked for more than 143 seconds.
Not tainted 6.6.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:19728 pid:5061 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x196c/0x4af0 kernel/sched/core.c:6695
schedule+0xc3/0x180 kernel/sched/core.c:6771
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6830
rwsem_down_write_slowpath+0xee6/0x13a0 kernel/locking/rwsem.c:1178
__down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
__super_lock fs/super.c:56 [inline]
__super_lock_excl fs/super.c:71 [inline]
deactivate_super+0xad/0xf0 fs/super.c:513
cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254
task_work_run+0x24a/0x300 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff2db87de17
RSP: 002b:00007ffc38934e88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff2db87de17
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffc38934f40
RBP: 00007ffc38934f40 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc38936000
R13: 00007ff2db8c73b9 R14: 0000000000042ad7 R15: 0000000000000006
Showing all locks held in the system:
4 locks held by kworker/u4:1/12:
#0: ffff8880b993c318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558
#1: ffff8880b9928808 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:999
#2: ffff8880b99296d8 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x120/0x260 kernel/time/timer.c:999
#3: ffffffff9214fdc0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_assert_init+0x164/0x420 lib/debugobjects.c:928
1 lock held by khungtaskd/29:
#0: ffffffff8d32c420 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
#0: ffffffff8d32c420 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:749 [inline]
#0: ffffffff8d32c420 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613
3 locks held by kworker/u4:5/940:
#0: ffff8880b983c318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558
#1: ffff8880b9828808 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:999
#2: ffff88801cd780d8 (&lo->lo_work_lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
#2: ffff88801cd780d8 (&lo->lo_work_lock){..-.}-{2:2}, at: loop_process_work+0x1dea/0x22a0 drivers/block/loop.c:1953
2 locks held by getty/4789:
#0: ffff88802a55a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1dc0 drivers/tty/n_tty.c:2206
1 lock held by syz-executor.1/5061:
#0: ffff8880646560e0 (&type->s_umount_key#25){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880646560e0 (&type->s_umount_key#25){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880646560e0 (&type->s_umount_key#25){++++}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:513
3 locks held by syz-executor.5/6225:
1 lock held by syz-executor.4/6302:
#0: ffff8880646560e0 (&type->s_umount_key#25){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880646560e0 (&type->s_umount_key#25){++++}-{3:3}, at: super_lock+0x176/0x390 fs/super.c:117
1 lock held by syz-executor.5/6329:
#0: ffff8880646560e0 (&type->s_umount_key#25){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880646560e0 (&type->s_umount_key#25){++++}-{3:3}, at: super_lock+0x176/0x390 fs/super.c:117
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfa9/0xff0 kernel/hung_task.c:379
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12 Comm: kworker/u4:1 Not tainted 6.6.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:__kmem_cache_alloc_node+0x0/0x270 mm/slub.c:3516
Code: fd ff ff 41 8b 44 24 28 49 c7 04 07 00 00 00 00 e9 eb fd ff ff 0f 0b e9 26 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <66> 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 28 4c 89 c5 49
RSP: 0018:ffffc90000117710 EFLAGS: 00000296
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000400
RDX: 00000000ffffffff RSI: 00000000000a2820 RDI: ffff888012841dc0
RBP: ffff888012841dc0 R08: ffffffff88adf561 R09: 0000000000000000
R10: ffff8880533743c0 R11: ffff888015e6d940 R12: 00000000ffffffff
R13: 00000000000a2820 R14: 0000000000000400 R15: ffffffff88adf561
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0037ce490 CR3: 0000000028f2f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__do_kmalloc_node mm/slab_common.c:1022 [inline]
__kmalloc_node_track_caller+0xa5/0x230 mm/slab_common.c:1043
kmalloc_reserve+0xf3/0x260 net/core/skbuff.c:581
__alloc_skb+0x1b1/0x420 net/core/skbuff.c:650
__netdev_alloc_skb+0x105/0x540 net/core/skbuff.c:714
__netdev_alloc_skb_ip_align include/linux/skbuff.h:3245 [inline]
netdev_alloc_skb_ip_align include/linux/skbuff.h:3255 [inline]
batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:558 [inline]
batadv_iv_ogm_queue_add+0x6a0/0xbf0 net/batman-adv/bat_iv_ogm.c:670
batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:833 [inline]
batadv_iv_ogm_schedule+0x85b/0x1090 net/batman-adv/bat_iv_ogm.c:868
batadv_iv_send_outstanding_bat_ogm_packet+0x6fe/0x810 net/batman-adv/bat_iv_ogm.c:1712
process_one_work kernel/workqueue.c:2630 [inline]
process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703
worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304