EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs error (device loop5): ext4_fill_super:4450: inode #2: comm syz-executor803: iget: root inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed INFO: task syz-executor803:11670 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor803 D28088 11670 8116 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 kthread_stop+0x109/0x6b0 kernel/kthread.c:588 ext4_fill_super+0x791e/0xc850 fs/ext4/super.c:4646 EXT4-fs error (device loop2): ext4_fill_super:4450: inode #2: comm syz-executor803: iget: root inode unallocated mount_bdev+0x2fc/0x3b0 fs/super.c:1158 EXT4-fs error (device loop3): ext4_fill_super:4450: inode #2: comm syz-executor803: iget: root inode unallocated EXT4-fs error (device loop0): ext4_fill_super:4450: inode #2: comm syz-executor803: iget: root inode unallocated EXT4-fs (loop3): get root inode failed mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 EXT4-fs error (device loop4): ext4_fill_super:4450: inode #2: comm syz-executor803: iget: root inode unallocated vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 EXT4-fs (loop4): get root inode failed EXT4-fs error (device loop5): ext4_fill_super:4450: inode #2: comm syz-executor803: iget: root inode unallocated EXT4-fs (loop3): mount failed EXT4-fs (loop4): mount failed EXT4-fs (loop2): get root inode failed ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 EXT4-fs (loop5): get root inode failed EXT4-fs (loop0): get root inode failed do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 EXT4-fs (loop2): mount failed entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f66d6fc308a EXT4-fs (loop0): mount failed Code: Bad RIP value. RSP: 002b:00007f66d6f6e078 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 EXT4-fs (loop5): mount failed RAX: ffffffffffffffda RBX: 00007f66d6f6e0d0 RCX: 00007f66d6fc308a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f66d6f6e090 RBP: 0000000000000007 R08: 00007f66d6f6e0d0 R09: 00007f66d6f6e6bc R10: 0000000000000000 R11: 0000000000000202 R12: 00007f66d6f6e090 R13: 00000000200002a8 R14: 0000000000000003 R15: 0000000000000004 EXT4-fs error (device loop4): ext4_fill_super:4450: inode #2: comm syz-executor803: iget: root inode unallocated Showing all locks held in the system: EXT4-fs (loop4): get root inode failed 1 lock held by khungtaskd/1570: EXT4-fs (loop4): mount failed #0: 00000000eb2f5904 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7834: 2 locks held by systemd-udevd/8141: #0: 00000000aaed3dea (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 #1: 000000008e9b7aa4 (loop_ctl_mutex){+.+.}, at: lo_open+0x19/0xd0 drivers/block/loop.c:1771 2 locks held by systemd-udevd/8150: 2 locks held by systemd-udevd/8163: #0: 00000000e9906daf (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xfc/0x870 fs/block_dev.c:1806 #1: 000000008e9b7aa4 (loop_ctl_mutex){+.+.}, at: __loop_clr_fd+0x777/0xe50 drivers/block/loop.c:1164 2 locks held by systemd-udevd/8180: #0: 000000005a127379 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 #1: 000000008e9b7aa4 (loop_ctl_mutex){+.+.}, at: lo_open+0x19/0xd0 drivers/block/loop.c:1771 2 locks held by systemd-udevd/8208: #0: 00000000555e355d (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 #1: 000000008e9b7aa4 (loop_ctl_mutex){+.+.}, at: lo_open+0x19/0xd0 drivers/block/loop.c:1771 1 lock held by syz-executor803/11670: #0: 00000000ac896bd3 (&type->s_umount_key#25/1){+.+.}, at: alloc_super fs/super.c:226 [inline] #0: 00000000ac896bd3 (&type->s_umount_key#25/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519 2 locks held by syz-executor803/8763: #0: 000000005a127379 (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xfc/0x870 fs/block_dev.c:1806 #1: 000000008e9b7aa4 (loop_ctl_mutex){+.+.}, at: lo_release+0x1a/0x1f0 drivers/block/loop.c:1790 2 locks held by syz-executor803/8764: #0: 00000000e9906daf (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 #1: 000000008e9b7aa4 (loop_ctl_mutex){+.+.}, at: lo_open+0x19/0xd0 drivers/block/loop.c:1771 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4686 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:23 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:write_comp_data+0xf/0x70 kernel/kcov.c:122 Code: 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 0f 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 c0 df 01 00 <65> 8b 05 7a 59 9f 7e a9 00 01 1f 00 75 4f 8b 86 60 13 00 00 83 f8 RSP: 0018:ffff8880a1197d80 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 00000000948a4760 RCX: ffffffff812b5c92 RDX: 0000000000000000 RSI: ffff8880a118e400 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8b270eb8 FS: 00007f9f16f568c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9f14857000 CR3: 00000000a10d8000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __virt_addr_valid+0xa2/0x240 arch/x86/mm/physaddr.c:60 check_heap_object mm/usercopy.c:232 [inline] __check_object_size mm/usercopy.c:290 [inline] __check_object_size+0xcb/0x3e0 mm/usercopy.c:260 check_object_size include/linux/thread_info.h:132 [inline] strncpy_from_user+0x9e/0x350 lib/strncpy_from_user.c:117 getname_flags+0x113/0x590 fs/namei.c:151 getname fs/namei.c:211 [inline] user_path_create fs/namei.c:3696 [inline] do_mkdirat+0x8d/0x2d0 fs/namei.c:3834 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f9f16211687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffecff6fc78 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffecff72b90 RCX: 00007f9f16211687 RDX: 00007f9f16c82a00 RSI: 00000000000001ed RDI: 000055f04f6518a0 RBP: 00007ffecff6fcb0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffecff72b90 R15: 00007ffecff701a0 ---------------- Code disassembly (best guess): 0: 8b 11 mov (%rcx),%edx 2: 48 83 c2 01 add $0x1,%rdx 6: 48 39 d0 cmp %rdx,%rax 9: 76 07 jbe 0x12 b: 48 89 34 d1 mov %rsi,(%rcx,%rdx,8) f: 48 89 11 mov %rdx,(%rcx) 12: c3 retq 13: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 1a: 00 1b: 49 89 f1 mov %rsi,%r9 1e: 49 89 fa mov %rdi,%r10 21: 65 48 8b 34 25 c0 df mov %gs:0x1dfc0,%rsi 28: 01 00 * 2a: 65 8b 05 7a 59 9f 7e mov %gs:0x7e9f597a(%rip),%eax # 0x7e9f59ab <-- trapping instruction 31: a9 00 01 1f 00 test $0x1f0100,%eax 36: 75 4f jne 0x87 38: 8b 86 60 13 00 00 mov 0x1360(%rsi),%eax 3e: 83 .byte 0x83 3f: f8 clc