INFO: task syz-executor252:9561 can't die for more than 143 seconds. task:syz-executor252 state:D stack:26648 pid: 9561 ppid: 3629 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5043 [inline] __schedule+0xa94/0x4910 kernel/sched/core.c:6352 schedule+0xd2/0x1f0 kernel/sched/core.c:6424 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x2af/0x360 kernel/sched/completion.c:106 kthread_stop+0x17a/0x720 kernel/kthread.c:708 ext4_stop_mmpd+0x47/0xd0 fs/ext4/mmp.c:255 __ext4_fill_super fs/ext4/super.c:5518 [inline] ext4_fill_super+0x9b5e/0xe820 fs/ext4/super.c:5567 get_tree_bdev+0x440/0x760 fs/super.c:1292 vfs_get_tree+0x89/0x2f0 fs/super.c:1497 do_new_mount fs/namespace.c:3025 [inline] path_mount+0x1320/0x1fa0 fs/namespace.c:3355 do_mount fs/namespace.c:3368 [inline] __do_sys_mount fs/namespace.c:3576 [inline] __se_sys_mount fs/namespace.c:3553 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3553 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f406a7688aa RSP: 002b:00007ffffccb3b18 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffffccb3b70 RCX: 00007f406a7688aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffffccb3b30 RBP: 00007ffffccb3b30 R08: 00007ffffccb3b70 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200003f8 R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000005 INFO: task syz-executor252:9561 blocked for more than 143 seconds. Not tainted 5.17.0-rc6-next-20220303-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor252 state:D stack:26648 pid: 9561 ppid: 3629 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5043 [inline] __schedule+0xa94/0x4910 kernel/sched/core.c:6352 schedule+0xd2/0x1f0 kernel/sched/core.c:6424 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x2af/0x360 kernel/sched/completion.c:106 kthread_stop+0x17a/0x720 kernel/kthread.c:708 ext4_stop_mmpd+0x47/0xd0 fs/ext4/mmp.c:255 __ext4_fill_super fs/ext4/super.c:5518 [inline] ext4_fill_super+0x9b5e/0xe820 fs/ext4/super.c:5567 get_tree_bdev+0x440/0x760 fs/super.c:1292 vfs_get_tree+0x89/0x2f0 fs/super.c:1497 do_new_mount fs/namespace.c:3025 [inline] path_mount+0x1320/0x1fa0 fs/namespace.c:3355 do_mount fs/namespace.c:3368 [inline] __do_sys_mount fs/namespace.c:3576 [inline] __se_sys_mount fs/namespace.c:3553 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3553 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f406a7688aa RSP: 002b:00007ffffccb3b18 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffffccb3b70 RCX: 00007f406a7688aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffffccb3b30 RBP: 00007ffffccb3b30 R08: 00007ffffccb3b70 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200003f8 R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000005 Showing all locks held in the system: 1 lock held by khungtaskd/28: #0: ffffffff8bd858e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6498 2 locks held by getty/3276: #0: ffff888011bb3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002e562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2075 1 lock held by syz-executor252/9561: #0: ffff88807341a0e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x1dd/0xa80 fs/super.c:228 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 5.17.0-rc6-next-20220303-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:256 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:413 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 986 Comm: kworker/u4:4 Not tainted 5.17.0-rc6-next-20220303-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:hlock_id kernel/locking/lockdep.c:430 [inline] RIP: 0010:__lock_acquire+0xa17/0x56c0 kernel/locking/lockdep.c:5048 Code: 21 83 e3 60 0f 85 f5 0b 00 00 4c 89 f8 44 89 7c 24 50 48 c1 e8 20 89 c3 89 44 24 60 44 01 f8 c1 c3 04 89 44 24 40 89 5c 24 58 <48> b8 00 00 00 00 00 fc ff df 48 8b 54 24 38 48 c1 ea 03 0f b6 04 RSP: 0018:ffffc90004cb7748 EFLAGS: 00000003 RAX: 000000004de047dc RBX: 00000000e1de6301 RCX: ffffffff815d675c RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88801cc4e311 RBP: ffff88801cc4e312 R08: 0000000000000000 R09: 0000000000000005 R10: fffffbfff2002b32 R11: 0000000000000001 R12: ffff88801cc4e2f0 R13: ffff88801cc4d7c0 R14: 0000000000000000 R15: 1e1de6302fc261ac FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055be32909038 CR3: 000000000ba8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5672 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5637 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:354 [inline] __get_locked_pte+0x154/0x270 mm/memory.c:1752 get_locked_pte include/linux/mm.h:2128 [inline] __text_poke+0x1ae/0x8c0 arch/x86/kernel/alternative.c:1000 text_poke arch/x86/kernel/alternative.c:1083 [inline] text_poke_bp_batch+0x433/0x6b0 arch/x86/kernel/alternative.c:1398 text_poke_flush arch/x86/kernel/alternative.c:1504 [inline] text_poke_flush arch/x86/kernel/alternative.c:1501 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1511 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x32f/0x410 kernel/jump_label.c:830 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:735 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:727 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 21 83 e3 60 0f 85 and %eax,-0x7af09f1d(%rbx) 6: f5 cmc 7: 0b 00 or (%rax),%eax 9: 00 4c 89 f8 add %cl,-0x8(%rcx,%rcx,4) d: 44 89 7c 24 50 mov %r15d,0x50(%rsp) 12: 48 c1 e8 20 shr $0x20,%rax 16: 89 c3 mov %eax,%ebx 18: 89 44 24 60 mov %eax,0x60(%rsp) 1c: 44 01 f8 add %r15d,%eax 1f: c1 c3 04 rol $0x4,%ebx 22: 89 44 24 40 mov %eax,0x40(%rsp) 26: 89 5c 24 58 mov %ebx,0x58(%rsp) * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 48 8b 54 24 38 mov 0x38(%rsp),%rdx 39: 48 c1 ea 03 shr $0x3,%rdx 3d: 0f .byte 0xf 3e: b6 04 mov $0x4,%dh