INFO: task syz-executor.0:4364 blocked for more than 143 seconds. Not tainted 5.18.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27656 pid: 4364 ppid: 4099 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5073 [inline] __schedule+0x913/0x26a0 kernel/sched/core.c:6388 schedule+0xd2/0x1f0 kernel/sched/core.c:6460 schedule_timeout+0x19d/0x250 kernel/time/timer.c:1860 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x373/0x530 kernel/sched/completion.c:106 kthread_stop+0x104/0x4f0 kernel/kthread.c:708 ext4_stop_mmpd+0x34/0xb0 fs/ext4/mmp.c:255 __ext4_fill_super fs/ext4/super.c:5554 [inline] ext4_fill_super+0x88bb/0xc290 fs/ext4/super.c:5603 get_tree_bdev+0x398/0x680 fs/super.c:1292 vfs_get_tree+0x7f/0x2c0 fs/super.c:1497 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x7e8/0x1a40 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x467afa RSP: 002b:00007f370bbbffa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000380 RCX: 0000000000467afa RDX: 0000000020000000 RSI: 00000000200000c0 RDI: 00007f370bbc0000 RBP: 00007f370bbc0040 R08: 00007f370bbc0040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 00000000200000c0 R14: 00007f370bbc0000 R15: 0000000020000200 Showing all locks held in the system: 1 lock held by khungtaskd/28: #0: ffffffff8af76920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6467 5 locks held by kworker/u4:3/218: 2 locks held by getty/3312: #0: ffff88807f6f8098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc900028e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x9d7/0xed0 drivers/tty/n_tty.c:2075 1 lock held by syz-executor.0/4364: #0: ffff888017a400e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x192/0x9e0 fs/super.c:228 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 5.18.0-rc6-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+0x57/0x7d lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x30/0xc0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x140/0x170 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0x88c/0xbf0 kernel/hung_task.c:369 kthread+0x299/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted 5.18.0-rc6-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_class kernel/locking/lockdep.c:201 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:190 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4727 [inline] RIP: 0010:__lock_acquire+0x635/0x5660 kernel/locking/lockdep.c:4979 Code: 39 f6 0f 8e 30 01 00 00 48 c7 c0 c8 ce c7 8c 4c 89 64 24 58 45 89 f4 49 bf 00 00 00 00 00 fc ff df 48 c1 e8 03 4c 8b 74 24 28 <4c> 01 f8 48 89 44 24 60 eb 66 48 8d 04 5b 48 c1 e0 06 48 05 60 bc RSP: 0018:ffffc90000107790 EFLAGS: 00000012 RAX: 1ffffffff198f9d9 RBX: ffff88801034c404 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000005 RDI: ffffffff8f1329d9 RBP: 0000000000000004 R08: dffffc0000000000 R09: ffffffff8f12b857 R10: fffffbfff1e2570a R11: 0000000000000001 R12: 0000000000000000 R13: ffff88801034ba00 R14: ffff88801034c420 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561dd5819680 CR3: 000000000ac8e000 CR4: 0000000000350ef0 Call Trace: lock_acquire kernel/locking/lockdep.c:5641 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606 __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:349 [inline] __get_locked_pte+0x105/0x210 mm/memory.c:1752 get_locked_pte include/linux/mm.h:2128 [inline] __text_poke+0x1ae/0x8c0 arch/x86/kernel/alternative.c:1038 text_poke arch/x86/kernel/alternative.c:1121 [inline] text_poke_bp_batch+0x435/0x6c0 arch/x86/kernel/alternative.c:1436 text_poke_flush arch/x86/kernel/alternative.c:1542 [inline] text_poke_flush arch/x86/kernel/alternative.c:1539 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1549 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x15f/0x220 kernel/jump_label.c:177 static_key_enable+0x11/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:774 [inline] toggle_allocation_gate+0xe3/0x310 mm/kfence/core.c:766 process_one_work+0x865/0x13d0 kernel/workqueue.c:2289 worker_thread+0x598/0xec0 kernel/workqueue.c:2436 kthread+0x299/0x340 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 ---------------- Code disassembly (best guess): 0: 39 f6 cmp %esi,%esi 2: 0f 8e 30 01 00 00 jle 0x138 8: 48 c7 c0 c8 ce c7 8c mov $0xffffffff8cc7cec8,%rax f: 4c 89 64 24 58 mov %r12,0x58(%rsp) 14: 45 89 f4 mov %r14d,%r12d 17: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 1e: fc ff df 21: 48 c1 e8 03 shr $0x3,%rax 25: 4c 8b 74 24 28 mov 0x28(%rsp),%r14 * 2a: 4c 01 f8 add %r15,%rax <-- trapping instruction 2d: 48 89 44 24 60 mov %rax,0x60(%rsp) 32: eb 66 jmp 0x9a 34: 48 8d 04 5b lea (%rbx,%rbx,2),%rax 38: 48 c1 e0 06 shl $0x6,%rax 3c: 48 rex.W 3d: 05 .byte 0x5 3e: 60 (bad) 3f: bc .byte 0xbc