INFO: task syz-executor426:12148 blocked for more than 143 seconds. Not tainted 5.17.0-rc5-syzkaller-00006-g917bbdb107f8 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor426 state:D stack:24592 pid:12148 ppid: 3635 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4995 [inline] __schedule+0x926/0x1080 kernel/sched/core.c:6304 schedule+0x12b/0x1f0 kernel/sched/core.c:6377 schedule_timeout+0xac/0x300 kernel/time/timer.c:1857 do_wait_for_common+0x2da/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+0x46/0x60 kernel/sched/completion.c:138 kthread_stop+0xf8/0x200 kernel/kthread.c:709 ext4_stop_mmpd+0x43/0xb0 fs/ext4/mmp.c:255 __ext4_fill_super+0x9b13/0xf6f0 fs/ext4/super.c:5505 ext4_fill_super+0x30d/0x6f0 fs/ext4/super.c:5554 get_tree_bdev+0x406/0x630 fs/super.c:1292 vfs_get_tree+0x86/0x270 fs/super.c:1497 do_new_mount fs/namespace.c:3024 [inline] path_mount+0x1986/0x2c30 fs/namespace.c:3354 do_mount fs/namespace.c:3367 [inline] __do_sys_mount fs/namespace.c:3575 [inline] __se_sys_mount+0x308/0x3c0 fs/namespace.c:3552 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fd82921dcba RSP: 002b:00007ffe8b98b238 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffe8b98b290 RCX: 00007fd82921dcba RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe8b98b250 RBP: 00007ffe8b98b250 R08: 00007ffe8b98b290 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000200003f8 R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000005 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8cb1d460 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/3274: #0: ffff88814a9c5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc90002b662e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2075 1 lock held by syz-executor426/12148: #0: ffff88801a8240e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x1c8/0x820 fs/super.c:228 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.17.0-rc5-syzkaller-00006-g917bbdb107f8 #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+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xc82/0xcd0 kernel/hung_task.c:369 kthread+0x2a3/0x2d0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 44 Comm: kworker/u4:2 Not tainted 5.17.0-rc5-syzkaller-00006-g917bbdb107f8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:kasan_check_range+0x2/0x2f0 mm/kasan/generic.c:188 Code: 48 89 c7 e8 30 26 4b 08 31 c0 c3 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc cc cc cc cc cc 41 57 <41> 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 0d 02 00 00 48 89 fb 48 RSP: 0018:ffffc9000114f690 EFLAGS: 00000093 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff813cb79f RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888011fd0668 RBP: ffffc9000114f7b0 R08: dffffc0000000000 R09: ffffed10023fa0ce R10: ffffed10023fa0ce R11: 0000000000000000 R12: ffff888011fd0668 R13: dffffc0000000000 R14: ffff888011fd0668 R15: ffffffff8cbe74a0 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564557c44018 CR3: 00000001406f7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_write include/linux/instrumented.h:86 [inline] clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline] cpumask_clear_cpu include/linux/cpumask.h:362 [inline] switch_mm_irqs_off+0x22f/0x910 arch/x86/mm/tlb.c:607 unuse_temporary_mm arch/x86/kernel/alternative.c:946 [inline] __text_poke+0x767/0x9f0 arch/x86/kernel/alternative.c:1042 text_poke arch/x86/kernel/alternative.c:1083 [inline] text_poke_bp_batch+0x680/0x920 arch/x86/kernel/alternative.c:1364 text_poke_flush arch/x86/kernel/alternative.c:1470 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1477 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x12d/0x250 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate+0xbf/0x460 mm/kfence/core.c:735 process_one_work+0x86c/0x1190 kernel/workqueue.c:2307 worker_thread+0xab1/0x1300 kernel/workqueue.c:2454 kthread+0x2a3/0x2d0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.055 msecs ---------------- Code disassembly (best guess): 0: 48 89 c7 mov %rax,%rdi 3: e8 30 26 4b 08 callq 0x84b2638 8: 31 c0 xor %eax,%eax a: c3 retq b: 0f 0b ud2 d: b8 ea ff ff ff mov $0xffffffea,%eax 12: c3 retq 13: 0f 0b ud2 15: b8 ea ff ff ff mov $0xffffffea,%eax 1a: c3 retq 1b: cc int3 1c: cc int3 1d: cc int3 1e: cc int3 1f: cc int3 20: cc int3 21: cc int3 22: cc int3 23: cc int3 24: cc int3 25: cc int3 26: cc int3 27: cc int3 28: 41 57 push %r15 * 2a: 41 56 push %r14 <-- trapping instruction 2c: 41 55 push %r13 2e: 41 54 push %r12 30: 53 push %rbx 31: b0 01 mov $0x1,%al 33: 48 85 f6 test %rsi,%rsi 36: 0f 84 0d 02 00 00 je 0x249 3c: 48 89 fb mov %rdi,%rbx 3f: 48 rex.W