INFO: task syz.0.958:14559 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.958       state:D stack:24960 pid:14559 tgid:14558 ppid:14177  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1585/0x5340
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd79299c799
RSP: 002b:00007fd79393b028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fd792c15fa0 RCX: 00007fd79299c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007fd792a32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd792c16038 R14: 00007fd792c15fa0 R15: 00007fffcc700d18
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/35:
 #0: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by dhcpcd/5549:
 #0: ffffffff8fbcd1c8 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x32b/0x1b30
2 locks held by getty/5632:
 #0: ffff88817a2540a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
3 locks held by kworker/1:3/5806:
 #0: ffff88810006b548 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830
 #1: ffffc900063bfc40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830
 #2: ffff88816ee5f240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
1 lock held by syz.5.185/7424:
3 locks held by kworker/1:8/9873:
 #0: ffff88810006b548 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830
 #1: ffffc9000661fc40 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830
 #2: ffffffff8fbcd1c8 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
1 lock held by syz-executor/10372:
1 lock held by syz.0.958/14559:
 #0: ffff8881773c00e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz.5.1423/17415:
2 locks held by syz-executor/17419:
 #0: ffffffff8f330c08 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8fbcd1c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10372 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc 89 f6 31 d2 e9 56 ac 76 03 66 0f 1f 44 00
RSP: 0018:ffffc90000007e48 EFLAGS: 00000046
RAX: 0000000000078440 RBX: ffff888121023e40 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 0000000000078440 RDI: 0000000000000838
RBP: 0000000000000000 R08: ffffffff81b2bc15 R09: ffffffff9a2b6508
R10: 0000000000000003 R11: ffffffff8173c750 R12: 000000001000035a
R13: dffffc0000000000 R14: 0000000000078440 R15: 0000000000000020
FS:  0000555584ffc500(0000) GS:ffff88818de64000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd418fe9e80 CR3: 000000011380a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x1c9/0x350
 hrtimer_interrupt+0xb08/0x1010
 __sysvec_apic_timer_interrupt+0x102/0x460
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x20b/0x2e0
Code: e9 30 ff ff ff e8 95 05 0c 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 11 43 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d ce 64 73
RSP: 0018:ffffc90004127278 EFLAGS: 00000286
RAX: 12899284966b0a00 RBX: 0000000000000246 RCX: 0000000000000046
RDX: 00000000e8ef333f RSI: ffffffff8e163d6d RDI: ffffffff8c27ae80
RBP: 0000000000000000 R08: ffffffff81767a45 R09: ffffffff8e7602e0
R10: ffffc900041273d8 R11: ffffffff81b0b0d0 R12: 0000000000000002
R13: ffffffff8e7602e0 R14: 0000000000000000 R15: 0000000000000000
 unwind_next_frame+0xc2/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kmem_cache_free+0x187/0x630
 xfs_trans_alloc+0x49c/0x9b0
 xfs_vn_sync_lazytime+0xaf/0x150
 sync_lazytime+0x12d/0x2d0
 iput+0x230/0xe80
 __dentry_kill+0x1a2/0x5e0
 shrink_kill+0xa9/0x2c0
 shrink_dentry_list+0x2e0/0x5e0
 shrink_dcache_tree+0xcf/0x310
 shrink_dcache_for_umount+0xa8/0x1f0
 generic_shutdown_super+0x6f/0x2d0
 kill_block_super+0x44/0x90
 xfs_kill_sb+0x15/0x50
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 do_exit+0x69b/0x2320
 do_group_exit+0x21b/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x221a/0x2240
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe17bb9c799
Code: Unable to access opcode bytes at 0x7fe17bb9c76f.
RSP: 002b:00007ffd2d40f588 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fe17bc32002 RCX: 00007fe17bb9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000016 R08: 0000000000000000 R09: 00007fe17bc31f90
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd2d410840
R13: 00007fe17bc31f90 R14: 0000555584ffc4e8 R15: 00007ffd2d413af0
 </TASK>
