DUID 00:04:53:46:a9:9d:03:7a:46:b2:48:ff:4a:ea:3f:46:f2:43 forked to background, child pid 3174 [ 28.652693][ T3175] 8021q: adding VLAN 0 to HW filter on device bond0 [ 28.665952][ T3175] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.233' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.073665][ T3590] loop0: detected capacity change from 0 to 131072 [ 50.088818][ T3590] F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 50.096812][ T3590] F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock [ 50.109557][ T3590] F2FS-fs (loop0): invalid crc_offset: 0 [ 50.119951][ T3590] F2FS-fs (loop0): Disable nat_bits due to incorrect cp_ver (13274671252798256465, 0) [ 50.167153][ T3590] F2FS-fs (loop0): Try to recover 2th superblock, ret: 0 [ 50.174330][ T3590] F2FS-fs (loop0): Mounted with checkpoint version = 15213551 [ 50.200328][ T3590] [ 50.202674][ T3590] ============================================ [ 50.208815][ T3590] WARNING: possible recursive locking detected [ 50.214958][ T3590] 5.17.0-rc2-next-20220202-syzkaller #0 Not tainted [ 50.221522][ T3590] -------------------------------------------- [ 50.227649][ T3590] syz-executor750/3590 is trying to acquire lock: [ 50.234046][ T3590] ffff88807d0f4390 (&sem->internal_rwsem#2){++++}-{3:3}, at: f2fs_write_checkpoint+0x535/0x5c90 [ 50.244502][ T3590] [ 50.244502][ T3590] but task is already holding lock: [ 50.251848][ T3590] ffff88807d0f5398 (&sem->internal_rwsem#2){++++}-{3:3}, at: f2fs_issue_checkpoint+0x149/0x480 [ 50.262284][ T3590] [ 50.262284][ T3590] other info that might help us debug this: [ 50.270339][ T3590] Possible unsafe locking scenario: [ 50.270339][ T3590] [ 50.277773][ T3590] CPU0 [ 50.281036][ T3590] ---- [ 50.284299][ T3590] lock(&sem->internal_rwsem#2); [ 50.289349][ T3590] lock(&sem->internal_rwsem#2); [ 50.294378][ T3590] [ 50.294378][ T3590] *** DEADLOCK *** [ 50.294378][ T3590] [ 50.302513][ T3590] May be due to missing lock nesting notation [ 50.302513][ T3590] [ 50.310824][ T3590] 2 locks held by syz-executor750/3590: [ 50.316363][ T3590] #0: ffff88801d7c40e0 (&type->s_umount_key#46){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 [ 50.326565][ T3590] #1: ffff88807d0f5398 (&sem->internal_rwsem#2){++++}-{3:3}, at: f2fs_issue_checkpoint+0x149/0x480 [ 50.337355][ T3590] [ 50.337355][ T3590] stack backtrace: [ 50.343321][ T3590] CPU: 0 PID: 3590 Comm: syz-executor750 Not tainted 5.17.0-rc2-next-20220202-syzkaller #0 [ 50.353291][ T3590] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.363341][ T3590] Call Trace: [ 50.366615][ T3590] [ 50.369547][ T3590] dump_stack_lvl+0xcd/0x134 [ 50.374160][ T3590] __lock_acquire.cold+0x149/0x3ab [ 50.379288][ T3590] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 50.385278][ T3590] lock_acquire+0x1ab/0x510 [ 50.389786][ T3590] ? f2fs_write_checkpoint+0x535/0x5c90 [ 50.395333][ T3590] ? lock_release+0x720/0x720 [ 50.400018][ T3590] ? add_lock_to_list.constprop.0+0x185/0x370 [ 50.406101][ T3590] down_write+0x90/0x150 [ 50.410448][ T3590] ? f2fs_write_checkpoint+0x535/0x5c90 [ 50.415993][ T3590] ? down_write_killable_nested+0x180/0x180 [ 50.421898][ T3590] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 50.428085][ T3590] ? add_lock_to_list.constprop.0+0x185/0x370 [ 50.434163][ T3590] f2fs_write_checkpoint+0x535/0x5c90 [ 50.439536][ T3590] ? lock_release+0x720/0x720 [ 50.444223][ T3590] ? sync_inodes_sb+0x6c6/0x9e0 [ 50.449090][ T3590] ? f2fs_get_sectors_written+0x410/0x410 [ 50.454810][ T3590] ? down_write+0xde/0x150 [ 50.459234][ T3590] ? down_write_killable_nested+0x180/0x180 [ 50.465130][ T3590] ? wait_for_completion_io+0x270/0x270 [ 50.470676][ T3590] ? sync_inodes_sb+0x69a/0x9e0 [ 50.475537][ T3590] f2fs_issue_checkpoint+0x156/0x480 [ 50.480816][ T3590] ? f2fs_destroy_checkpoint_caches+0x20/0x20 [ 50.486876][ T3590] ? _raw_spin_unlock_irq+0x1f/0x40 [ 50.492075][ T3590] ? sync_inodes_sb+0x6cb/0x9e0 [ 50.496928][ T3590] ? inode_to_bdi+0x98/0x150 [ 50.501512][ T3590] ? try_to_writeback_inodes_sb+0xc0/0xc0 [ 50.507236][ T3590] ? filemap_fdatawrite_range+0xe0/0xe0 [ 50.512791][ T3590] f2fs_sync_fs+0x20f/0x420 [ 50.517389][ T3590] ? f2fs_drop_inode+0xa20/0xa20 [ 50.522325][ T3590] sync_filesystem.part.0+0x13c/0x1d0 [ 50.527688][ T3590] sync_filesystem+0x8b/0xc0 [ 50.532274][ T3590] generic_shutdown_super+0x70/0x400 [ 50.537556][ T3590] kill_block_super+0x97/0xf0 [ 50.542231][ T3590] kill_f2fs_super+0x2b3/0x3c0 [ 50.546994][ T3590] ? f2fs_dquot_commit+0xd0/0xd0 [ 50.551931][ T3590] ? kfree+0x1ed/0x2d0 [ 50.555989][ T3590] ? up_write+0x148/0x470 [ 50.560314][ T3590] ? unregister_shrinker+0x1f5/0x2f0 [ 50.565593][ T3590] deactivate_locked_super+0x94/0x160 [ 50.570969][ T3590] deactivate_super+0xad/0xd0 [ 50.575646][ T3590] cleanup_mnt+0x3a2/0x540 [ 50.580071][ T3590] task_work_run+0xdd/0x1a0 [ 50.584606][ T3590] do_exit+0xb29/0x2b10 [ 50.588856][ T3590] ? lock_downgrade+0x6e0/0x6e0 [ 50.593733][ T3590] ? lock_downgrade+0x6e0/0x6e0 [ 50.598585][ T3590] ? mm_update_next_owner+0x7a0/0x7a0 [ 50.603965][ T3590] do_group_exit+0xd2/0x2f0 [ 50.608470][ T3590] __x64_sys_exit_group+0x3a/0x50 [ 50.613496][ T3590] do_syscall_64+0x35/0xb0 [ 50.617908][ T3590] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 50.623807][ T3590] RIP: 0033:0x7f62db64d949 [ 50.628210][ T3590] Code: Unable to access opcode bytes at RIP 0x7f62db64d91f. [ 50.635559][ T3590] RSP: 002b:00007ffe5daa3ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 50.643966][ T3590] RAX: ffffffffffffffda RBX: 00007f62db6c3330 RCX: 00007f62db64d949 [ 50.651928][ T3590] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 [ 50.659886][ T3590] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 0000000000000000 [ 50.667864][ T