cramfs: wrong magic cramfs: wrong magic cramfs: wrong magic INFO: task syz-executor.2:8831 blocked for more than 140 seconds. cramfs: wrong magic Not tainted 4.14.289-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28720 8831 8003 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 cramfs: wrong magic schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x4af/0xe90 kernel/time/timer.c:1747 cramfs: wrong magic do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 cramfs: wrong magic usb_start_wait_urb+0x125/0x440 drivers/usb/core/message.c:61 usb_bulk_msg+0x1f6/0x500 drivers/usb/core/message.c:252 proc_bulk+0x331/0x6d0 drivers/usb/core/devio.c:1223 cramfs: wrong magic usbdev_do_ioctl+0x5b0/0x2b70 drivers/usb/core/devio.c:2449 usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2599 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f039e044209 RSP: 002b:00007f039c9b9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f039e156f60 RCX: 00007f039e044209 RDX: 00000000200000c0 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 00007f039e09e161 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc896313f R14: 00007f039c9b9300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.289-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 25397 Comm: systemd-udevd Not tainted 4.14.289-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 task: ffff8880973302c0 task.stack: ffff88807c5f0000 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:60 RSP: 0018:ffff88807c5f78d8 EFLAGS: 00000286 RAX: 1ffff1101292c833 RBX: ffff888094964190 RCX: 00000000000069dc RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888094964198 RBP: ffffc900007fc2e8 R08: ffffffff8b9d59e0 R09: 0000000000040063 R10: ffff888097330b70 R11: ffff8880973302c0 R12: ffff88807c5f7d08 R13: 00000000fbc5dd5d R14: dffffc0000000000 R15: ffff8880949641e0 FS: 00007f42a785a8c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff01c39fe8 CR3: 00000000b5174000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __d_lookup+0x1d2/0x660 fs/dcache.c:2328 lookup_fast+0x312/0xe30 fs/namei.c:1641 walk_component+0xc0/0xbc0 fs/namei.c:1821 link_path_walk+0x823/0x10a0 fs/namei.c:2154 path_openat+0x15e/0x2970 fs/namei.c:3568 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f42a69a0840 RSP: 002b:00007fff01c361c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000705 RCX: 00007f42a69a0840 RDX: 0000000000000005 RSI: 0000000000080000 RDI: 00007fff01c361d0 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000012 R10: 0000000000000064 R11: 0000000000000246 R12: 00007fff01c37210 R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000f Code: ff ff 48 89 df e8 21 b9 29 00 e9 9f fe ff ff 4c 89 e7 e8 14 b9 29 00 e9 2c fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <65> 48 8b 04 25 c0 7f 02 00 48 85 c0 74 1a 65 8b 15 1b 38 ad 7e