INFO: task syz-executor:7853 blocked for more than 149 seconds.
Not tainted 6.11.0-rc7-syzkaller-00149-g0babf683783d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20992 pid:7853 tgid:7853 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x1800/0x4a60 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
schedule_timeout+0xb0/0x310 kernel/time/timer.c:2557
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
kthread_stop+0x19e/0x640 kernel/kthread.c:710
ext4_stop_mmpd+0x47/0xb0 fs/ext4/mmp.c:261
ext4_put_super+0x753/0xd50 fs/ext4/super.c:1365
generic_shutdown_super+0x138/0x2d0 fs/super.c:642
kill_block_super+0x44/0x90 fs/super.c:1696
ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7289
deactivate_locked_super+0xc6/0x130 fs/super.c:473
cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
task_work_run+0x251/0x310 kernel/task_work.c:228
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x168/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f90e797f227
RSP: 002b:00007ffc79354858 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f90e797f227
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc79354910
RBP: 00007ffc79354910 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc79355990
R13: 00007f90e79f0a14 R14: 0000000000091b29 R15: 00007ffc793559d0
INFO: task kmmpd-loop1:8750 blocked for more than 150 seconds.
Not tainted 6.11.0-rc7-syzkaller-00149-g0babf683783d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kmmpd-loop1 state:D stack:27088 pid:8750 tgid:8750 ppid:2 flags:0x00024000
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x1800/0x4a60 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
percpu_rwsem_wait+0x3c2/0x450 kernel/locking/percpu-rwsem.c:162
__percpu_down_read+0xee/0x130 kernel/locking/percpu-rwsem.c:177
percpu_down_read include/linux/percpu-rwsem.h:65 [inline]
__sb_start_write include/linux/fs.h:1676 [inline]
sb_start_write include/linux/fs.h:1812 [inline]
write_mmp_block+0x2f2/0x3a0 fs/ext4/mmp.c:66
kmmpd+0x26d/0xaa0 fs/ext4/mmp.c:246
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
4 locks held by kworker/u8:4/62:
#0: ffff88801bae5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff88801bae5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc900015dfd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc900015dfd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffffffff8fc7f750 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594
#3: ffffffff8f9fd510 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_exit_net+0x8e/0x350 drivers/infiniband/core/device.c:1129
2 locks held by getty/4986:
#0: ffff8880302e60a0 (&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+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:4/5243:
#0: ffff88801ac78948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
#0: ffff88801ac78948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
#1: ffffc900033bfd00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
#1: ffffc900033bfd00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
#2: ffff88807849e240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1489
1 lock held by syz-executor/7853:
#0: ffff88802944c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88802944c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88802944c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
3 locks held by kworker/u8:23/8617:
#0: ffff8880b883e9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:568
#1: ffff8880b8828948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:989
#2: ffff8880287e4388 (&wb->work_lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
#2: ffff8880287e4388 (&wb->work_lock){..-.}-{2:2}, at: wb_wakeup_delayed fs/fs-writeback.c:163 [inline]
#2: ffff8880287e4388 (&wb->work_lock){..-.}-{2:2}, at: wb_workfn+0xfa7/0x1090 fs/fs-writeback.c:2331
2 locks held by syz-executor/8624:
1 lock held by kmmpd-loop1/8750:
#0: ffff88802944c420 (sb_writers#4){++++}-{0:0}, at: kmmpd+0x26d/0xaa0 fs/ext4/mmp.c:246
3 locks held by kworker/1:0/9012:
#0: ffff8880b883e9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:568
#1: ffff8880b8928948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:989
#2: ffff8880b892a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 kernel/time/timer.c:1051
1 lock held by syz-executor/9578:
#0: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6644
1 lock held by syz.5.956/9589:
#0: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline]
#0: ffffffff8e93d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:958
2 locks held by syz-executor/9677:
#0: ffffffff8fc7f750 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
#1: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: ip_tunnel_init_net+0x20e/0x710 net/ipv4/ip_tunnel.c:1158
2 locks held by syz-executor/9689:
#0: ffffffff8fc7f750 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c6/0x7b0 net/core/net_namespace.c:504
#1: ffffffff8fc8c308 (rtnl_mutex){+.+.}-{3:3}, at: ip_tunnel_init_net+0x20e/0x710 net/ipv4/ip_tunnel.c:1158
1 lock held by syz.1.992/9745:
#0: ffff88802944c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88802944c0e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc7-syzkaller-00149-g0babf683783d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
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+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.11.0-rc7-syzkaller-00149-g0babf683783d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:unwind_next_frame+0x1e60/0x2a00 arch/x86/kernel/unwind_orc.c:672
Code: 24 08 0f 84 42 01 00 00 e8 1d 47 52 00 e9 06 fd ff ff e8 13 47 52 00 eb 0c e8 0c 47 52 00 eb 05 e8 05 47 52 00 bf 01 00 00 00 7b bb 21 00 65 8b 1d 4c 91 c2 7e 31 ff 89 de e8 2b 4b 52 00 85
RSP: 0018:ffffc90000157508 EFLAGS: 00000246
RAX: ffffffff814145ab RBX: ffffc90000158000 RCX: ffff88801cad5a00
RDX: 0000000000000100 RSI: ffffc90000157e48 RDI: 0000000000000001
RBP: ffffc900001575e0 R08: ffffffff81414545 R09: ffffffff814140bf
R10: 0000000000000003 R11: ffff88801cad5a00 R12: ffffc90000157ee0
R13: dffffc0000000000 R14: ffffc90000150000 R15: ffffc90000157ee8
FS: 0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556a1e45c8 CR3: 000000006dca6000 CR4: 0000000000350ef0
Call Trace:
arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2256 [inline]
slab_free mm/slub.c:4477 [inline]
kmem_cache_free+0x145/0x350 mm/slub.c:4552
rcu_do_batch kernel/rcu/tree.c:2569 [inline]
rcu_core+0xaff/0x1830 kernel/rcu/tree.c:2843
handle_softirqs+0x2c6/0x970 kernel/softirq.c:554
run_ksoftirqd+0xca/0x130 kernel/softirq.c:928
smpboot_thread_fn+0x546/0xa30 kernel/smpboot.c:164
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244