INFO: task syz-executor.4:15454 blocked for more than 143 seconds. Not tainted 5.15.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27152 pid:15454 ppid: 16529 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: 0033:0x7fe8af4b1709 RSP: 002b:00007fe8aca07188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000800 RBX: 00007fe8af5b6020 RCX: 00007fe8af4b1709 RDX: 0000000000000000 RSI: 0000000000006b46 RDI: 0000000000000006 RBP: 00007fe8af50bcb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd42fdcd1f R14: 00007fe8aca07300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97d460 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6232: #0: ffff88801e62d630 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc2-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2961 Comm: systemd-journal Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:unwind_next_frame+0x359/0x1ce0 arch/x86/kernel/unwind_orc.c:456 Code: c0 0f 84 39 02 00 00 4d 8d 78 04 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 0f b6 04 02 4c 89 fa 83 e2 07 38 d0 7f 08 <84> c0 0f 85 1e 09 00 00 41 0f b6 40 04 a8 0f 0f 85 aa 00 00 00 49 RSP: 0018:ffffc90002b476d0 EFLAGS: 00000093 RAX: 0000000000000000 RBX: 1ffff92000568ee2 RCX: ffffffff89400067 RDX: 0000000000000002 RSI: ffffffff8e7fd4d0 RDI: ffffffff8ddfb144 RBP: 0000000000000001 R08: ffffffff8e7fd4d6 R09: ffffffff8e7fd4d0 R10: fffff52000568f00 R11: 0000000000086089 R12: ffffc90002b477f0 R13: ffffc90002b477dd R14: ffffc90002b477a8 R15: ffffffff8e7fd4da FS: 00007f347fa328c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f347d147010 CR3: 0000000012791000 CR4: 00000000001506f0 Call Trace: arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 save_stack+0x151/0x1e0 mm/page_owner.c:119 __set_page_owner+0x50/0x290 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x460 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3316 [inline] kmem_cache_alloc+0x454/0x540 mm/slab.c:3507 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags+0x9a/0xe0 include/linux/audit.h:319 user_path_at_empty+0x2b/0x60 fs/namei.c:2800 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x127/0x850 fs/open.c:421 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: 0033:0x7f347eced9c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffffc1025a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffffc1054c0 RCX: 00007f347eced9c7 RDX: 00007f347f75ea00 RSI: 0000000000000000 RDI: 000055e09a8b69a3 RBP: 00007ffffc1025e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffffc1054c0 R15: 00007ffffc102ad0 ---------------- Code disassembly (best guess): 0: c0 0f 84 rorb $0x84,(%rdi) 3: 39 02 cmp %eax,(%rdx) 5: 00 00 add %al,(%rax) 7: 4d 8d 78 04 lea 0x4(%r8),%r15 b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 12: fc ff df 15: 4c 89 fa mov %r15,%rdx 18: 48 c1 ea 03 shr $0x3,%rdx 1c: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 20: 4c 89 fa mov %r15,%rdx 23: 83 e2 07 and $0x7,%edx 26: 38 d0 cmp %dl,%al 28: 7f 08 jg 0x32 * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 0f 85 1e 09 00 00 jne 0x950 32: 41 0f b6 40 04 movzbl 0x4(%r8),%eax 37: a8 0f test $0xf,%al 39: 0f 85 aa 00 00 00 jne 0xe9 3f: 49 rex.WB