VFS: Found a V7 FS (block size = 512) on device loop3 INFO: task syz-executor.1:6759 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-executor.1 D29464 6759 9107 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_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 sysv_new_inode+0x133/0x1300 fs/sysv/ialloc.c:151 sysv_mknod fs/sysv/namei.c:67 [inline] sysv_create+0x1d/0xe0 fs/sysv/namei.c:80 vfs_create+0x461/0x6c0 fs/namei.c:2913 do_mknodat.part.0+0x2ff/0x480 fs/namei.c:3768 do_mknodat fs/namei.c:3789 [inline] __do_sys_mknodat fs/namei.c:3792 [inline] __se_sys_mknodat fs/namei.c:3789 [inline] __x64_sys_mknodat+0x116/0x160 fs/namei.c:3789 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f51c6d08279 Code: Bad RIP value. RSP: 002b:00007f51c565c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000103 RAX: ffffffffffffffda RBX: 00007f51c6e1b050 RCX: 00007f51c6d08279 gfs2: gfs2 mount does not exist RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000005 RBP: 00007f51c6d622e9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5621fc2f R14: 00007f51c565c300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1571: #0: 000000007bbab323 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by systemd-udevd/4696: 1 lock held by in:imklog/7795: #0: 0000000022bb0b1e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by syz-executor.3/8161: #0: 000000002deeb180 (&bdev->bd_mutex){+.+.}, at: __blkdev_put+0xfc/0x870 fs/block_dev.c:1806 #1: 00000000dc2a5b04 (loop_ctl_mutex){+.+.}, at: __loop_clr_fd+0x88/0xe50 drivers/block/loop.c:1080 2 locks held by kworker/u4:4/30812: 2 locks held by syz-executor.1/6755: 3 locks held by syz-executor.1/6759: #0: 0000000003dc7bd8 (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 0000000003dc7bd8 (sb_writers#20){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 0000000059d6bf19 (&type->i_mutex_dir_key#9/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 0000000059d6bf19 (&type->i_mutex_dir_key#9/1){+.+.}, at: filename_create+0x15a/0x490 fs/namei.c:3638 #2: 000000004d1eaf4a (&sbi->s_lock#2){+.+.}, at: sysv_new_inode+0x133/0x1300 fs/sysv/ialloc.c:151 3 locks held by syz-executor.1/15111: 2 locks held by syz-executor.3/15115: 3 locks held by syz-executor.4/15116: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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: 15122 Comm: systemd-udevd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:lock_release+0xc/0x8b0 kernel/locking/lockdep.c:3917 Code: 00 4c 8b 4c 24 10 e9 9f fd ff ff 48 c7 c7 40 f7 36 8d e8 e7 17 4d 00 e9 dc fd ff ff 66 90 48 b8 00 00 00 00 00 fc ff df 41 57 <41> 56 41 55 49 89 d5 41 54 55 48 89 fd 53 48 83 ec 78 48 c7 44 24 RSP: 0000:ffff88809600fb30 EFLAGS: 00000207 RAX: dffffc0000000000 RBX: ffff88809600fd48 RCX: ffffffff81518c83 RDX: ffffffff819ec55f RSI: 0000000000000001 RDI: ffffffff89f85fa0 RBP: ffffea0002284ac0 R08: 0000000000000000 R09: ffffed101742455a R10: ffff8880ba122ad3 R11: 0000000000000000 R12: 000000008a12b025 R13: ffff8880af356840 R14: ffff8880af356880 R15: 0000000000000000 FS: 00007f349baf68c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056309c2aa3c0 CR3: 00000000b40ed000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: alloc_set_pte+0x927/0x1a00 mm/memory.c:3629 filemap_map_pages+0xd66/0x11c0 mm/filemap.c:2700 do_fault_around mm/memory.c:3776 [inline] do_read_fault mm/memory.c:3810 [inline] do_fault mm/memory.c:3944 [inline] handle_pte_fault mm/memory.c:4175 [inline] __handle_mm_fault+0x2a8e/0x41c0 mm/memory.c:4299 handle_mm_fault+0x436/0xb10 mm/memory.c:4336 __do_page_fault+0x68e/0xd60 arch/x86/mm/fault.c:1412 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205 RIP: 0033:0x56309c2aa3c0 Code: eb d6 0f b6 47 06 48 c1 e0 30 48 0b 42 20 48 89 c1 48 89 42 20 e9 73 ff ff ff b8 01 00 00 00 e9 ce fd ff ff 66 0f 1f 44 00 00 <48> 83 ec 08 48 85 ff 74 77 48 85 f6 0f 84 8e 00 00 00 48 8b 16 48 RSP: 002b:00007ffe87cf9978 EFLAGS: 00010202 RAX: 000056309c2ef990 RBX: 000056309cda71c0 RCX: 000000000000000e RDX: 000056309cdb4e70 RSI: 000056309cda71d0 RDI: 00007ffe87cf9980 RBP: 0000000000003afb R08: 0000000000000000 R09: 000056309cdbe200 R10: 000000000000000f R11: 000056309c2ed9a0 R12: 0000000000003afb R13: 000056309cdb06e0 R14: 000056309cda1010 R15: 000056309cda1028