INFO: task syz-executor.2:12349 blocked for more than 143 seconds. Not tainted 6.10.0-rc4-next-20240621-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:20240 pid:12349 tgid:12349 ppid:12348 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594 __schedule_loop kernel/sched/core.c:6671 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6686 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6743 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752 cgroup_lock include/linux/cgroup.h:367 [inline] cgroup_kn_lock_live+0xe6/0x290 kernel/cgroup/cgroup.c:1662 __cgroup_procs_write+0xf4/0x4f0 kernel/cgroup/cgroup.c:5163 cgroup_procs_write+0x29/0x50 kernel/cgroup/cgroup.c:5203 cgroup_file_write+0x2ce/0x6d0 kernel/cgroup/cgroup.c:4107 kernfs_fop_write_iter+0x3a1/0x500 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa72/0xc90 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0af307bdef RSP: 002b:00007fffbd1be940 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0af307bdef RDX: 0000000000000001 RSI: 00007fffbd1be990 RDI: 0000000000000003 RBP: 00007fffbd1bef20 R08: 0000000000000000 R09: 00007fffbd1be797 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007fffbd1be990 R14: 00007fffbd1bef20 R15: 00007fffbd1beee0 INFO: task syz-executor.0:12495 blocked for more than 143 seconds. Not tainted 6.10.0-rc4-next-20240621-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:24976 pid:12495 tgid:12494 ppid:12166 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594 __schedule_loop kernel/sched/core.c:6671 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6686 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 __flush_work+0xaa9/0xd00 kernel/workqueue.c:4203 __lru_add_drain_all+0x4f6/0x560 mm/swap.c:901 invalidate_bdev+0x76/0xa0 block/bdev.c:100 btrfs_get_bdev_and_sb+0x11a/0x1c0 fs/btrfs/volumes.c:492 btrfs_open_one_device fs/btrfs/volumes.c:657 [inline] open_fs_devices+0x2ae/0x12a0 fs/btrfs/volumes.c:1196 btrfs_get_tree_super fs/btrfs/super.c:1826 [inline] btrfs_get_tree+0x504/0x1920 fs/btrfs/super.c:2089 vfs_get_tree+0x90/0x2a0 fs/super.c:1789 fc_mount+0x1b/0xb0 fs/namespace.c:1125 btrfs_get_tree_subvol fs/btrfs/super.c:2052 [inline] btrfs_get_tree+0x652/0x1920 fs/btrfs/super.c:2090 vfs_get_tree+0x90/0x2a0 fs/super.c:1789 do_new_mount+0x2be/0xb40 fs/namespace.c:3379 do_mount fs/namespace.c:3719 [inline] __do_sys_mount fs/namespace.c:3925 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3902 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fec37c7e7aa RSP: 002b:00007fec389b3ef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fec389b3f80 RCX: 00007fec37c7e7aa RDX: 0000000020000200 RSI: 0000000020005600 RDI: 00007fec389b3f40 RBP: 0000000020000200 R08: 00007fec389b3f80 R09: 0000000000000800 R10: 0000000000000800 R11: 0000000000000202 R12: 0000000020005600 R13: 00007fec389b3f40 R14: 000000000000559e R15: 0000000020000240 INFO: task rm:12493 blocked for more than 144 seconds. Not tainted 6.10.0-rc4-next-20240621-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:rm state:D stack:23680 pid:12493 tgid:12493 ppid:12466 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5249 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6594 __schedule_loop kernel/sched/core.c:6671 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6686 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] cgroup_threadgroup_change_begin include/linux/cgroup-defs.h:790 [inline] exit_signals+0x4a9/0x5c0 kernel/signal.c:3000 do_exit+0x6b4/0x28e0 kernel/exit.c:835 do_group_exit+0x207/0x2c0 kernel/exit.c:1025 __do_sys_exit_group kernel/exit.c:1036 [inline] __se_sys_exit_group kernel/exit.c:1034 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb7a45c8a90 RSP: 002b:00007fffe01025c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fb7a46b9860 RCX: 00007fb7a45c8a90 RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00007fb7a46b9860 R08: 00007fffe0102440 R09: 00007fffe0102520 R10: 00007fffe0102480 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb7a46bd658 R15: 0000000000000001 Showing all locks held in the system: 1 lock held by kthreadd/2: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x21db/0x3d90 kernel/fork.c:2472 1 lock held by khungtaskd/30: #0: ffffffff8e3357a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:333 [inline] #0: ffffffff8e3357a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:845 [inline] #0: ffffffff8e3357a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6688 1 lock held by udevd/4546: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x21db/0x3d90 kernel/fork.c:2472 2 locks held by getty/4843: #0: ffff88802eda10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211 1 lock held by syz-fuzzer/5081: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5082: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5083: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5084: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5085: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5086: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5087: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5093: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5094: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5096: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5099: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5100: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-fuzzer/5300: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by kworker/u9:0/8792: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by kworker/u9:1/9663: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by kworker/u9:2/9673: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by udevd/11965: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by udevd/11992: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by udevd/12032: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by udevd/12099: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-executor.1/12137: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-executor.0/12160: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-executor.4/12243: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-executor.3/12267: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 6 locks held by syz-executor.3/12270: 1 lock held by syz-executor.2/12348: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 3 locks held by syz-executor.2/12349: #0: ffff888022c7c420 (sb_writers#10){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2872 [inline] #0: ffff888022c7c420 (sb_writers#10){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586 #1: ffff88805b341c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325 #2: ffffffff8e363868 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_lock include/linux/cgroup.h:367 [inline] #2: ffffffff8e363868 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_kn_lock_live+0xe6/0x290 kernel/cgroup/cgroup.c:1662 1 lock held by udevd/12351: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by udevd/12352: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by udevd/12353: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 1 lock held by syz-executor.4/12468: 2 locks held by syz-executor.1/12478: 1 lock held by syz-executor.0/12494: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 2 locks held by syz-executor.0/12495: #0: ffffffff8e8ac528 (uuid_mutex){+.+.}-{3:3}, at: btrfs_get_tree_super fs/btrfs/super.c:1810 [inline] #0: ffffffff8e8ac528 (uuid_mutex){+.+.}-{3:3}, at: btrfs_get_tree+0x2dc/0x1920 fs/btrfs/super.c:2089 #1: ffffffff8e3ef508 (lock#3){+.+.}-{3:3}, at: __lru_add_drain_all+0x66/0x560 mm/swap.c:856 1 lock held by rm/12493: #0: ffffffff8e363a50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: do_exit+0x6b4/0x28e0 kernel/exit.c:835 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc4-next-20240621-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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+0xfee/0x1030 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 12473 Comm: syz-executor.1 Not tainted 6.10.0-rc4-next-20240621-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:check_wait_context kernel/locking/lockdep.c:4858 [inline] RIP: 0010:__lock_acquire+0x93e/0x2000 kernel/locking/lockdep.c:5143 Code: 31 db 48 8d ab c4 00 00 00 48 89 e8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 92 00 00 00 0f b6 6d 00 40 84 ed 74 32 0f b6 44 24 08 <40> 0f b6 cd 40 38 e8 0f 42 c8 89 4c 24 08 48 81 c3 c6 00 00 00 48 RSP: 0018:ffffc90000a18970 EFLAGS: 00000002 RAX: 0000000000000002 RBX: ffffffff92ccc008 RCX: ffffffff816f6c6a RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff92fe4740 RBP: 0000000000000002 R08: ffffffff92fe4747 R09: 1ffffffff25fc8e8 R10: dffffc0000000000 R11: fffffbfff25fc8e9 R12: ffff888019f68b28 R13: 0000000000000001 R14: 0000000000000001 R15: ffff888019f68b28 FS: 00007f8f3d5766c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8f3d575f00 CR3: 000000005f138000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816 rcu_lock_acquire include/linux/rcupdate.h:333 [inline] rcu_read_lock include/linux/rcupdate.h:845 [inline] __lock_task_sighand+0x49/0x2d0 kernel/signal.c:1395 lock_task_sighand include/linux/sched/signal.h:746 [inline] send_sigqueue+0x25d/0x760 kernel/signal.c:1995 posix_timer_event kernel/time/posix-timers.c:298 [inline] posix_timer_fn+0x18a/0x3a0 kernel/time/posix-timers.c:324 __run_hrtimer kernel/time/hrtimer.c:1687 [inline] __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1751 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1813 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 1a 37 d7 f5 48 89 df e8 52 7a d8 f5 e8 ad dc 02 f6 fb bf 01 00 00 00 c2 42 ca f5 65 8b 05 03 89 6b 74 85 c0 74 06 5b c3 cc cc cc cc RSP: 0018:ffffc900098bfc70 EFLAGS: 00000282 RAX: 909e0e6f10912500 RBX: ffff888019f1ef00 RCX: ffffffff947dc803 RDX: dffffc0000000000 RSI: ffffffff8bcac8a0 RDI: 0000000000000001 RBP: ffffc900098bfdb0 R08: ffffffff8faeddef R09: 1ffffffff1f5dbbd R10: dffffc0000000000 R11: fffffbfff1f5dbbe R12: 0000000000000021 R13: 1ffff110033e3e73 R14: ffff888019f1f398 R15: ffff888019f1ef00 spin_unlock_irq include/linux/spinlock.h:401 [inline] get_signal+0x14dd/0x1740 kernel/signal.c:2912 arch_do_signal_or_restart+0x96/0x830 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [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+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8f3c87d0a7 Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 RSP: 002b:00007f8f3d5760c8 EFLAGS: 00000246 RAX: 000000000000012b RBX: 00007f8f3c9b3f80 RCX: 00007f8f3c87d0a9 RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007f8f3c8ec074 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f8f3c9b3f80 R15: 00007ffd27e54698