syzbot

INFO: task syz-executor293:3557 blocked for more than 143 seconds.
      Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:24696 pid: 3557 ppid:  3556 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
 __down_write_common kernel/locking/rwsem.c:1284 [inline]
 __down_write kernel/locking/rwsem.c:1293 [inline]
 down_write+0x164/0x170 kernel/locking/rwsem.c:1542
 unregister_shrinker+0x60/0x320 mm/vmscan.c:678
 xfs_free_buftarg+0x12/0x60 fs/xfs/xfs_buf.c:1889
 xfs_close_devices+0x181/0x1b0 fs/xfs/xfs_super.c:390
 xfs_fs_put_super+0x234/0x2b0 fs/xfs/xfs_super.c:1098
 generic_shutdown_super+0x136/0x2c0 fs/super.c:475
 kill_block_super+0x7a/0xe0 fs/super.c:1405
 deactivate_locked_super+0xa0/0x110 fs/super.c:335
 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
 task_work_run+0x129/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92eb7
RSP: 002b:00007ffd6bdf77f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f737ee92eb7
RDX: 00007ffd6bdf78b9 RSI: 000000000000000a RDI: 00007ffd6bdf78b0
RBP: 00007ffd6bdf78b0 R08: 00000000ffffffff R09: 00007ffd6bdf7690
R10: 0000555556504653 R11: 0000000000000202 R12: 00007ffd6bdf8920
R13: 00005555565045f0 R14: 00007ffd6bdf7820 R15: 0000000000000003
 </TASK>
INFO: task syz-executor293:3559 blocked for more than 143 seconds.
      Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:25472 pid: 3559 ppid:  3556 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
 __down_write_common kernel/locking/rwsem.c:1284 [inline]
 __down_write kernel/locking/rwsem.c:1293 [inline]
 down_write+0x164/0x170 kernel/locking/rwsem.c:1542
 unregister_shrinker+0x60/0x320 mm/vmscan.c:678
 xfs_free_buftarg+0x12/0x60 fs/xfs/xfs_buf.c:1889
 xfs_close_devices+0x181/0x1b0 fs/xfs/xfs_super.c:390
 xfs_fs_put_super+0x234/0x2b0 fs/xfs/xfs_super.c:1098
 generic_shutdown_super+0x136/0x2c0 fs/super.c:475
 kill_block_super+0x7a/0xe0 fs/super.c:1405
 deactivate_locked_super+0xa0/0x110 fs/super.c:335
 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
 task_work_run+0x129/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92eb7
RSP: 002b:00007ffd6bdf77f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f737ee92eb7
RDX: 00007ffd6bdf78b9 RSI: 000000000000000a RDI: 00007ffd6bdf78b0
RBP: 00007ffd6bdf78b0 R08: 00000000ffffffff R09: 00007ffd6bdf7690
R10: 0000555556504653 R11: 0000000000000202 R12: 00007ffd6bdf8920
R13: 00005555565045f0 R14: 00007ffd6bdf7820 R15: 0000000000000003
 </TASK>
INFO: task syz-executor293:3562 blocked for more than 143 seconds.
      Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:25696 pid: 3562 ppid:  3556 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
 __down_write_common kernel/locking/rwsem.c:1284 [inline]
 __down_write kernel/locking/rwsem.c:1293 [inline]
 down_write+0x164/0x170 kernel/locking/rwsem.c:1542
 unregister_shrinker+0x60/0x320 mm/vmscan.c:678
 xfs_free_buftarg+0x12/0x60 fs/xfs/xfs_buf.c:1889
 xfs_close_devices+0x181/0x1b0 fs/xfs/xfs_super.c:390
 xfs_fs_put_super+0x234/0x2b0 fs/xfs/xfs_super.c:1098
 generic_shutdown_super+0x136/0x2c0 fs/super.c:475
 kill_block_super+0x7a/0xe0 fs/super.c:1405
 deactivate_locked_super+0xa0/0x110 fs/super.c:335
 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143
 task_work_run+0x129/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92eb7
RSP: 002b:00007ffd6bdf77f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f737ee92eb7
RDX: 00007ffd6bdf78b9 RSI: 000000000000000a RDI: 00007ffd6bdf78b0
RBP: 00007ffd6bdf78b0 R08: 00000000ffffffff R09: 00007ffd6bdf7690
R10: 0000555556504653 R11: 0000000000000202 R12: 00007ffd6bdf8920
R13: 00005555565045f0 R14: 00007ffd6bdf7820 R15: 0000000000000003
 </TASK>
INFO: task syz-executor293:3694 blocked for more than 144 seconds.
      Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:22496 pid: 3694 ppid:  3560 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6514
 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 xfs_qm_dqfree_one+0x66/0x170 fs/xfs/xfs_qm.c:1607
 xfs_qm_shrink_scan+0x314/0x3d0 fs/xfs/xfs_qm.c:523
 do_shrink_slab+0x542/0xda0 mm/vmscan.c:758
 shrink_slab+0x233/0x960 mm/vmscan.c:918
 drop_slab_node+0xed/0x180 mm/vmscan.c:953
 drop_slab+0x8b/0x120 mm/vmscan.c:963
 drop_caches_sysctl_handler+0xb3/0x160 fs/drop_caches.c:66
 proc_sys_call_handler+0x541/0x8a0 fs/proc/proc_sysctl.c:587
 do_iter_readv_writev+0x594/0x7a0
 do_iter_write+0x1ea/0x760 fs/read_write.c:855
 iter_file_splice_write+0x806/0xfa0 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0xe3/0x1c0 fs/splice.c:936
 splice_direct_to_actor+0x500/0xc10 fs/splice.c:891
 do_splice_direct+0x285/0x3d0 fs/splice.c:979
 do_sendfile+0x625/0xff0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1311 [inline]
 __se_sys_sendfile64+0xfc/0x1e0 fs/read_write.c:1303
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee91b19
RSP: 002b:00007ffd6bdf88e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00000000000f35f4 RCX: 00007f737ee91b19
RDX: 0000000020002080 RSI: 0000000000000004 RDI: 0000000000000005
RBP: 0000000000000000 R08: 00007ffd6bdf8910 R09: 00007ffd6bdf8910
R10: 0000000000000875 R11: 0000000000000246 R12: 00007ffd6bdf890c
R13: 00007ffd6bdf8940 R14: 00007ffd6bdf8920 R15: 0000000000000002
 </TASK>
INFO: task syz-executor293:3696 blocked for more than 144 seconds.
      Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:23584 pid: 3696 ppid:  3558 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 schedule_timeout+0xac/0x300 kernel/time/timer.c:1860
 do_wait_for_common+0x2d9/0x480 kernel/sched/completion.c:85
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:138
 xfs_buf_iowait+0xb4/0x400 fs/xfs/xfs_buf.c:1573
 xfs_buf_delwri_pushbuf+0x2cf/0x4b0 fs/xfs/xfs_buf.c:2251
 xfs_qm_flush_one+0x266/0x350 fs/xfs/xfs_qm.c:1249
 xfs_qm_dquot_walk+0x22a/0x4a0 fs/xfs/xfs_qm.c:86
 xfs_qm_quotacheck+0x2f7/0x640 fs/xfs/xfs_qm.c:1335
 xfs_qm_mount_quotas+0x328/0x610 fs/xfs/xfs_qm.c:1441
 xfs_mountfs+0x162b/0x1ca0 fs/xfs/xfs_mount.c:904
 xfs_fs_fill_super+0x100c/0x1240 fs/xfs/xfs_super.c:1658
 get_tree_bdev+0x3fe/0x620 fs/super.c:1303
 vfs_get_tree+0x88/0x270 fs/super.c:1508
 do_new_mount+0x28b/0xad0 fs/namespace.c:2994
 do_mount fs/namespace.c:3337 [inline]
 __do_sys_mount fs/namespace.c:3545 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92f7a
RSP: 002b:00007ffd6bdf8758 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00646975756f6e2c RCX: 00007f737ee92f7a
RDX: 0000000020009700 RSI: 0000000020009740 RDI: 00007ffd6bdf8770
RBP: 00007ffd6bdf8770 R08: 00007ffd6bdf87b0 R09: 00000000000096c5
R10: 0000000002000000 R11: 0000000000000206 R12: 0000000000000004
R13: 00005555565032c0 R14: 0000000002000000 R15: 00007ffd6bdf87b0
 </TASK>
INFO: task syz-executor293:3746 blocked for more than 144 seconds.
      Not tainted 5.15.110-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor293 state:D stack:25560 pid: 3746 ppid:  3561 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
 __down_write_common kernel/locking/rwsem.c:1284 [inline]
 __down_write kernel/locking/rwsem.c:1293 [inline]
 down_write+0x164/0x170 kernel/locking/rwsem.c:1542
 prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
 prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620
 alloc_super+0x757/0x940 fs/super.c:270
 sget_fc+0x21e/0x630 fs/super.c:541
 get_tree_bdev+0x26b/0x620 fs/super.c:1273
 vfs_get_tree+0x88/0x270 fs/super.c:1508
 do_new_mount+0x28b/0xad0 fs/namespace.c:2994
 do_mount fs/namespace.c:3337 [inline]
 __do_sys_mount fs/namespace.c:3545 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f737ee92f7a
RSP: 002b:00007ffd6bdf8758 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00646975756f6e2c RCX: 00007f737ee92f7a
RDX: 0000000020009700 RSI: 0000000020009740 RDI: 00007ffd6bdf8770
RBP: 00007ffd6bdf8770 R08: 00007ffd6bdf87b0 R09: 00000000000096c5
R10: 0000000002000000 R11: 0000000000000206 R12: 0000000000000004
R13: 00005555565032c0 R14: 0000000002000000 R15: 00007ffd6bdf87b0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c91c4e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by klogd/2950:
 #0: ffff8880b9b39698 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
2 locks held by getty/3258:
 #0: ffff88814b344098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900024a42e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1da0 drivers/tty/n_tty.c:2147
2 locks held by syz-executor293/3557:
 #0: ffff88801fa4e0e0 (&type->s_umount_key#44){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
 #1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x60/0x320 mm/vmscan.c:678
2 locks held by syz-executor293/3559:
 #0: ffff88801f9fa0e0 (&type->s_umount_key#44){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
 #1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x60/0x320 mm/vmscan.c:678
2 locks held by syz-executor293/3562:
 #0: ffff88801f3600e0 (&type->s_umount_key#44){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
 #1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x60/0x320 mm/vmscan.c:678
3 locks held by syz-executor293/3694:
 #0: ffff888023ed8460 (sb_writers#4){.+.+}-{0:0}, at: do_sendfile+0x600/0xff0 fs/read_write.c:1248
 #1: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x125/0x960 mm/vmscan.c:908
 #2: ffff88801a7ae158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dqfree_one+0x66/0x170 fs/xfs/xfs_qm.c:1607
3 locks held by syz-executor293/3696:
 #0: ffff888022b740e0 (&type->s_umount_key#42/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
 #1: ffff88801a7ae158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dquot_walk+0x132/0x4a0 fs/xfs/xfs_qm.c:73
 #2: ffff888079d78f38 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_dqlock fs/xfs/xfs_dquot.h:133 [inline]
 #2: ffff888079d78f38 (&dqp->q_qlock){+.+.}-{3:3}, at: xfs_qm_flush_one+0xca/0x350 fs/xfs/xfs_qm.c:1225
3 locks held by syz-executor293/3746:
 #0: ffff888017f35888 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: get_tree_bdev+0x197/0x620 fs/super.c:1263
 #1: ffff8880772740e0 (&type->s_umount_key#42/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
 #2: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
 #2: ffffffff8c9b9eb0 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xe72/0xeb0 kernel/hung_task.c:295
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:570