EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs error (device loop4): ext4_fill_super:4450: inode #2: comm syz-executor186: iget: root inode unallocated EXT4-fs (loop4): get root inode failed EXT4-fs (loop4): mount failed INFO: task syz-executor186:12441 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-executor186 D28096 12441 8110 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 mount_bdev+0x2fc/0x3b0 fs/super.c:1158 mount_fs+0xa3/0x310 fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x115c/0x2f50 fs/namespace.c:2822 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 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe EXT4-fs error (device loop3): ext4_fill_super:4450: inode #2: comm syz-executor186: iget: root inode unallocated RIP: 0033:0x7eff43c6dcfa Code: Bad RIP value. EXT4-fs error (device loop1): ext4_fill_super:4450: inode #2: comm syz-executor186: iget: root inode unallocated EXT4-fs (loop1): get root inode failed EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs (loop1): mount failed RSP: 002b:00007eff43c11168 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007eff43c111c0 RCX: 00007eff43c6dcfa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007eff43c11180 RBP: 000000000000000b R08: 00007eff43c111c0 R09: 00007eff43c116b8 R10: 0000000000000000 R11: 0000000000000206 R12: 00007eff43c11180 R13: 0000000020000308 R14: 0000000000000003 R15: 0000000000000004 Showing all locks held in the system: EXT4-fs error (device loop5): ext4_fill_super:4450: inode #2: comm syz-executor186: iget: root inode unallocated EXT4-fs (loop5): get root inode failed 1 lock held by khungtaskd/1530: #0: 0000000016e7aaca (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 EXT4-fs (loop5): mount failed 1 lock held by in:imklog/7763: #0: 00000000e2e2456c (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by systemd-udevd/8142: #0: 00000000aa30a351 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000aa30a351 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000aa30a351 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #1: 00000000aa30a351 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 EXT4-fs error (device loop4): ext4_fill_super:4450: inode #2: comm syz-executor186: iget: root inode unallocated EXT4-fs error (device loop1): ext4_fill_super:4450: inode #2: comm syz-executor186: iget: root inode unallocated EXT4-fs error (device loop2): ext4_fill_super:4450: inode #2: comm syz-executor186: iget: root inode unallocated 1 lock held by systemd-udevd/8145: EXT4-fs (loop1): get root inode failed 2 locks held by systemd-udevd/8174: EXT4-fs (loop1): mount failed #0: 000000009abb9bc3 (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xfc/0x870 fs/block_dev.c:1806 EXT4-fs (loop4): get root inode failed #1: 00000000ac913013 (loop_ctl_mutex){+.+.}, at: __loop_clr_fd+0x88/0xe50 drivers/block/loop.c:1080 EXT4-fs (loop4): mount failed 1 lock held by syz-executor186/12441: #0: 00000000e9cb3f3f (&type->s_umount_key#25/1){+.+.}, at: alloc_super fs/super.c:226 [inline] #0: 00000000e9cb3f3f (&type->s_umount_key#25/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519 EXT4-fs (loop2): get root inode failed 4 locks held by syz-executor186/31725: 1 lock held by syz-executor186/31756: #0: 00000000e911853a (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 EXT4-fs (loop2): mount failed 2 locks held by syz-executor186/31750: #0: 0000000000d62211 (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xfc/0x870 fs/block_dev.c:1806 #1: 00000000ac913013 (loop_ctl_mutex){+.+.}, at: lo_release+0x1a/0x1f0 drivers/block/loop.c:1790 1 lock held by syz-executor186/31751: #0: 000000009abb9bc3 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 fs/block_dev.c:1478 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1530 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7764 Comm: rs:main Q:Reg Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:PagePoisoned include/linux/page-flags.h:162 [inline] RIP: 0010:page_to_nid include/linux/mm.h:990 [inline] RIP: 0010:page_zone include/linux/mm.h:1106 [inline] RIP: 0010:__inc_zone_page_state+0x0/0xb0 mm/vmstat.c:412 Code: d8 65 41 88 45 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 89 74 24 04 e8 0e 78 11 00 8b 74 24 04 e9 33 ff ff ff 0f 1f 44 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 55 48 c1 ea 03 53 48 83 ec RSP: 0018:ffff8880937ef8a8 EFLAGS: 00000093 RAX: ffff8880aaacc580 RBX: ffffffff8b26e134 RCX: ffffffff83771e23 RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffea00022238c0 RBP: ffff8880ac2f6158 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffffea00022238c0 R13: ffffffffffffffff R14: 0000000000000001 R15: ffff88813be82548 FS: 00007f82adba3700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f69468df000 CR3: 00000000b3591000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: account_page_dirtied+0x512/0xbb0 mm/page-writeback.c:2423 __set_page_dirty+0x7f/0x3e0 fs/buffer.c:582 mark_buffer_dirty+0x424/0x5c0 fs/buffer.c:1111 __block_commit_write.constprop.0.isra.0+0x173/0x310 fs/buffer.c:2051 block_write_end fs/buffer.c:2163 [inline] generic_write_end+0x5e/0x1a0 fs/buffer.c:2173 ext4_da_write_end+0x623/0xa70 fs/ext4/inode.c:3201 generic_perform_write+0x2ae/0x4d0 mm/filemap.c:3181 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f82b05e71cd Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f82adba2590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f82a400b950 RCX: 00007f82b05e71cd RDX: 000000000000049f RSI: 00007f82a400b950 RDI: 0000000000000009 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f82a400b6d0 R13: 00007f82adba25b0 R14: 000055839b5bf7c0 R15: 000000000000049f ---------------- Code disassembly (best guess): 0: d8 65 41 fsubs 0x41(%rbp) 3: 88 45 00 mov %al,0x0(%rbp) 6: 48 83 c4 08 add $0x8,%rsp a: 5b pop %rbx b: 5d pop %rbp c: 41 5c pop %r12 e: 41 5d pop %r13 10: 41 5e pop %r14 12: c3 retq 13: 89 74 24 04 mov %esi,0x4(%rsp) 17: e8 0e 78 11 00 callq 0x11782a 1c: 8b 74 24 04 mov 0x4(%rsp),%esi 20: e9 33 ff ff ff jmpq 0xffffff58 25: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 48 89 fa mov %rdi,%rdx 37: 55 push %rbp 38: 48 c1 ea 03 shr $0x3,%rdx 3c: 53 push %rbx 3d: 48 rex.W 3e: 83 .byte 0x83 3f: ec in (%dx),%al