INFO: task syz-executor.2:12642 blocked for more than 143 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27152 pid:12642 ppid: 2202 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 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+0x176/0x280 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1176 [inline] io_wq_put_and_exit+0x4b2/0xd20 fs/io-wq.c:1211 io_uring_clean_tctx fs/io_uring.c:9675 [inline] io_uring_cancel_generic+0x5fe/0x740 fs/io_uring.c:9755 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f3853722739 RSP: 002b:00007f3850c78188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000800 RBX: 00007f3853827038 RCX: 00007f3853722739 RDX: 0000000000000000 RSI: 0000000000006b46 RDI: 0000000000000006 RBP: 00007f385377ccc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3853827038 R13: 00007fff51816def R14: 00007f3850c78300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97d3e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6443: #0: ffff88801d45e670 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by agetty/6451: #0: ffff888012387098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc900015002e8 (&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: 27 Comm: khungtaskd Not tainted 5.15.0-rc1-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:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 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+0x3e5/0x4d0 kernel/kthread.c:319 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: 2958 Comm: systemd-journal Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x8fe/0x54a0 kernel/locking/lockdep.c:4988 Code: 03 38 d0 7c 08 84 d2 0f 85 d7 48 00 00 8b 0d 89 9f ca 0e 85 c9 0f 84 05 07 00 00 49 8d 85 e8 09 00 00 48 89 c2 48 89 44 24 68 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 73 37 RSP: 0018:ffffc90002bd7688 EFLAGS: 00000047 RAX: ffff8880137baa68 RBX: 0000000000000021 RCX: ffffffff815a408a RDX: ffff8880137baa68 RSI: 0000000000000008 RDI: ffffffff8fcff920 RBP: ffff8880137bab12 R08: 0000000000000000 R09: ffffffff8fcff927 R10: fffffbfff1f9ff24 R11: 0000000000000000 R12: ffff8880137baaf0 R13: ffff8880137ba080 R14: ffff8880137baa78 R15: dffffc0000000000 FS: 00007fc2edf5d8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc2e94d3000 CR3: 0000000076888000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] free_unref_page_list+0x2e0/0xfa0 mm/page_alloc.c:3450 release_pages+0x830/0x20b0 mm/swap.c:950 __pagevec_lru_add+0xd82/0x1be0 mm/swap.c:1043 lru_cache_add+0x5f9/0xa70 mm/swap.c:453 shmem_getpage_gfp+0x8db/0x25e0 mm/shmem.c:1940 shmem_getpage mm/shmem.c:151 [inline] shmem_fallocate+0x8c4/0xf80 mm/shmem.c:2735 vfs_fallocate+0x48d/0xe10 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0xcf/0x140 fs/open.c:336 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: 0033:0x7fc2ed21cbc6 Code: 24 00 75 bf eb a0 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 53 49 89 f1 48 89 d3 49 89 d2 b8 1d 01 00 00 48 89 f2 31 f6 0f 05 <3d> 00 f0 ff ff 76 13 83 f8 a1 74 16 f7 d8 5b c3 66 2e 0f 1f 84 00 RSP: 002b:00007ffd63a157c0 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 0000000000800000 RCX: 00007fc2ed21cbc6 RDX: 0000000001800000 RSI: 0000000000000000 RDI: 0000000000000010 RBP: 0000000000000006 R08: 0000000001800000 R09: 0000000001800000 R10: 0000000000800000 R11: 0000000000000246 R12: 0000560cf229eea0 R13: 00007ffd63a158f0 R14: 00007ffd63a158e8 R15: 0000000002000000 ---------------- Code disassembly (best guess): 0: 03 38 add (%rax),%edi 2: d0 7c 08 84 sarb -0x7c(%rax,%rcx,1) 6: d2 0f rorb %cl,(%rdi) 8: 85 d7 test %edx,%edi a: 48 00 00 rex.W add %al,(%rax) d: 8b 0d 89 9f ca 0e mov 0xeca9f89(%rip),%ecx # 0xeca9f9c 13: 85 c9 test %ecx,%ecx 15: 0f 84 05 07 00 00 je 0x720 1b: 49 8d 85 e8 09 00 00 lea 0x9e8(%r13),%rax 22: 48 89 c2 mov %rax,%rdx 25: 48 89 44 24 68 mov %rax,0x68(%rsp) * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 48 c1 ea 03 shr $0x3,%rdx 38: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 3c: 0f .byte 0xf 3d: 85 73 37 test %esi,0x37(%rbx)