INFO: task syz-executor220:3627 blocked for more than 143 seconds. Not tainted 5.16.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor220 state:D stack:25848 pid: 3627 ppid: 3626 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x174/0x270 kernel/sched/completion.c:138 flush_workqueue+0x3ed/0x15b0 kernel/workqueue.c:2870 nbd_start_device_ioctl drivers/block/nbd.c:1408 [inline] __nbd_ioctl drivers/block/nbd.c:1471 [inline] nbd_ioctl+0x6d8/0xb10 drivers/block/nbd.c:1511 blkdev_ioctl+0x37a/0x800 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 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: 0033:0x7f25c24ab389 RSP: 002b:00007ffd8ab5c898 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f25c24ab389 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffd8ab5ca38 R09: 00007ffd8ab5ca38 R10: 00007ffd8ab5ca38 R11: 0000000000000246 R12: 00007f25c246a6a0 R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8bb812e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 3 locks held by kworker/u5:0/46: #0: ffff888147490938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888147490938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888147490938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888147490938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] #0: ffff888147490938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] #0: ffff888147490938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269 #1: ffffc90001177db0 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 #2: ffff88807db23120 (sk_lock-AF_AX25){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1645 [inline] #2: ffff88807db23120 (sk_lock-AF_AX25){+.+.}-{0:0}, at: ax25_recvmsg+0xbc/0x850 net/ax25/af_ax25.c:1627 2 locks held by getty/3287: #0: ffff88807ec29098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc90002b8e2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc5-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+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10 Comm: kworker/u4:1 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__pte_needs_invert arch/x86/include/asm/pgtable-invert.h:18 [inline] RIP: 0010:protnone_mask arch/x86/include/asm/pgtable-invert.h:24 [inline] RIP: 0010:pmd_pfn arch/x86/include/asm/pgtable.h:193 [inline] RIP: 0010:pte_lockptr include/linux/mm.h:2319 [inline] RIP: 0010:__get_locked_pte+0x1c6/0x4d0 mm/memory.c:1722 Code: ff 49 83 c7 80 0f 84 9b 02 00 00 e8 54 ac ca ff 4d 89 f7 31 ff 49 83 e7 9f 4c 89 fe e8 d3 ae ca ff 4d 85 ff 0f 84 10 01 00 00 35 ac ca ff 4c 89 f6 31 ff e8 bb ae ca ff e8 26 ac ca ff 4d 89 RSP: 0018:ffffc90000f0f9c8 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 00002aaaaaaab000 RCX: 0000000140ba5007 RDX: 0000000000000000 RSI: ffff888011c7e280 RDI: 0000000000000003 RBP: ffff888140ba4aa8 R08: 0000000000000000 R09: ffffea000006f307 R10: ffffffff81ac389d R11: 000000000000003f R12: ffff888011c28740 R13: ffffc90000f0fa60 R14: 0000000140ba5067 R15: 0000000140ba5007 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe8fb3c448 CR3: 000000000b88e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_locked_pte include/linux/mm.h:2160 [inline] __text_poke+0x1ae/0x8c0 arch/x86/kernel/alternative.c:1000 text_poke_bp_batch+0x3d7/0x560 arch/x86/kernel/alternative.c:1361 text_poke_flush arch/x86/kernel/alternative.c:1451 [inline] text_poke_flush arch/x86/kernel/alternative.c:1448 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1458 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d5/0x430 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:732 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:724 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.166 msecs ---------------- Code disassembly (best guess): 0: ff 49 83 decl -0x7d(%rcx) 3: c7 80 0f 84 9b 02 00 movl $0x54e80000,0x29b840f(%rax) a: 00 e8 54 d: ac lods %ds:(%rsi),%al e: ca ff 4d lret $0x4dff 11: 89 f7 mov %esi,%edi 13: 31 ff xor %edi,%edi 15: 49 83 e7 9f and $0xffffffffffffff9f,%r15 19: 4c 89 fe mov %r15,%rsi 1c: e8 d3 ae ca ff callq 0xffcaaef4 21: 4d 85 ff test %r15,%r15 24: 0f 84 10 01 00 00 je 0x13a * 2a: e8 35 ac ca ff callq 0xffcaac64 <-- trapping instruction 2f: 4c 89 f6 mov %r14,%rsi 32: 31 ff xor %edi,%edi 34: e8 bb ae ca ff callq 0xffcaaef4 39: e8 26 ac ca ff callq 0xffcaac64 3e: 4d rex.WRB 3f: 89 .byte 0x89