====================================================== WARNING: possible circular locking dependency detected 4.19.167-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/12713 is trying to acquire lock: 0000000040ce4b4c (&p->lock){+.+.}, at: seq_read+0x6b/0x1160 fs/seq_file.c:161 but task is already holding lock: 00000000d26df629 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2780 [inline] 00000000d26df629 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_do_remove+0xf0/0xdb0 fs/overlayfs/dir.c:843 vfs_rmdir.part.0+0x10f/0x3d0 fs/namei.c:3882 vfs_rmdir fs/namei.c:3868 [inline] do_rmdir+0x3fd/0x490 fs/namei.c:3943 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&ovl_i_mutex_dir_key[depth]#2){++++}: inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&sig->cred_guard_mutex){+.+.}: lock_trace fs/proc/base.c:402 [inline] proc_pid_stack+0x160/0x350 fs/proc/base.c:452 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4be/0x1160 fs/seq_file.c:229 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xd7/0x1260 kernel/locking/mutex.c:1072 seq_read+0x6b/0x1160 fs/seq_file.c:161 proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &p->lock --> &ovl_i_mutex_dir_key[depth]#2 --> sb_writers#3 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#3); lock(&ovl_i_mutex_dir_key[depth]#2); lock(sb_writers#3); lock(&p->lock); *** DEADLOCK *** 1 lock held by syz-executor.0/12713: #0: 00000000d26df629 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2780 [inline] #0: 00000000d26df629 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446 stack backtrace: CPU: 1 PID: 12713 Comm: syz-executor.0 Not tainted 4.19.167-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/0x2fe lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1865 [inline] check_prevs_add kernel/locking/lockdep.c:1978 [inline] validate_chain kernel/locking/lockdep.c:2419 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3415 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xd7/0x1260 kernel/locking/mutex.c:1072 seq_read+0x6b/0x1160 fs/seq_file.c:161 proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 overlayfs: failed to resolve './file1': -2 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 netlink: 32 bytes leftover after parsing attributes in process `syz-executor.4'. do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5c709adc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005 RBP: 000000000119c070 R08: 0000000000000000 R09: 0000000000000000 R10: 4000000000010046 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffcab5994bf R14: 00007f5c709ae9c0 R15: 000000000119c034 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 32 bytes leftover after parsing attributes in process `syz-executor.4'. overlayfs: unrecognized mount option "low" or missing value overlayfs: unrecognized mount option "low" or missing value overlayfs: filesystem on './file1' not supported as upperdir overlayfs: upperdir is in-use as upperdir/workdir of another mount, mount with '-o index=off' to override exclusive upperdir protection. overlayfs: failed to resolve './bs': -2 EXT4-fs (loop5): Unrecognized mount option "3Y􃶮N" or missing value overlayfs: filesystem on './file1' not supported as upperdir overlayfs: missing 'lowerdir' FAT-fs (loop4): Unrecognized mount option "nnonumtail=1" or missing value 9pnet: Insufficient options for proto=fd overlayfs: missing 'lowerdir' audit: type=1804 audit(1610876924.291:91): pid=12814 uid=0 auid=0 ses=4 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir288976188/syzkaller.MwbzGU/1797/bus" dev="sda1" ino=16083 res=1 overlayfs: unrecognized mount option "0x0000000000000003" or missing value overlayfs: unrecognized mount option "uppeerdir=./bus" or missing value audit: type=1804 audit(1610876924.321:92): pid=12814 uid=0 auid=0 ses=4 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir288976188/syzkaller.MwbzGU/1797/bus" dev="sda1" ino=16083 res=1 overlayfs: unrecognized mount option "uppeerdir=./bus" or missing value overlayfs: filesystem on './file1' not supported as upperdir overlayfs: unrecognized mount option "0x0000000000000003" or missing value audit: type=1804 audit(1610876924.321:93): pid=12814 uid=0 auid=0 ses=4 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.5" name="/root/syzkaller-testdir288976188/syzkaller.MwbzGU/1797/bus" dev="sda1" ino=16083 res=1 audit: type=1804 audit(1610876924.381:94): pid=12822 uid=0 auid=0 ses=4 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir288976188/syzkaller.MwbzGU/1797/bus" dev="sda1" ino=16083 res=1 audit: type=1800 audit(1610876924.441:95): pid=12814 uid=0 auid=0 ses=4 subj==unconfined op=collect_data cause=failed comm="syz-executor.5" name="bus" dev="sda1" ino=16083 res=0 overlayfs: unrecognized mount option "u perdir=/file1" or missing value netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. audit: type=1800 audit(1610876924.441:96): pid=12822 uid=0 auid=0 ses=4 subj==unconfined op=collect_data cause=failed comm="syz-executor.5" name="bus" dev="sda1" ino=16083 res=0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' MTD: Attempt to mount non-MTD device "/dev/loop4" romfs: VFS: Can't find a romfs filesystem on dev loop4. overlayfs: missing 'lowerdir' overlayfs: filesystem on './file1' not supported as upperdir overlayfs: unrecognized mount option "" or missing value MTD: Attempt to mount non-MTD device "/dev/loop4" romfs: VFS: Can't find a romfs filesystem on dev loop4. overlayfs: unrecognized mount option "" or missing value overlayfs: unrecognized mount option "metacopy=on.+WX`0`ASwRਉ~EJ{ʞ$֟)" or missing value overlayfs: filesystem on './file1' not supported as upperdir overlayfs: unrecognized mount option "metacopy=onE*" or missing value audit: type=1804 audit(1610876925.411:97): pid=12941 uid=0 auid=0 ses=4 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir288976188/syzkaller.MwbzGU/1802/bus" dev="sda1" ino=15810 res=1 audit: type=1804 audit(1610876925.481:98): pid=12955 uid=0 auid=0 ses=4 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir288976188/syzkaller.MwbzGU/1802/bus" dev="sda1" ino=15810 res=1 EXT4-fs (loop4): ext4_check_descriptors: Checksum for group 0 failed (60935!=0) overlayfs: filesystem on './file1' not supported as upperdir EXT4-fs (loop4): orphan cleanup on readonly fs EXT4-fs error (device loop4): ext4_mb_generate_buddy:744: group 0, block bitmap and bg descriptor inconsistent: 8192 vs 0 free clusters EXT4-fs error (device loop4) in ext4_do_update_inode:5398: error 27 EXT4-fs error (device loop4) in ext4_do_update_inode:5398: error 27 EXT4-fs error (device loop4) in ext4_do_update_inode:5398: error 27 overlayfs: filesystem on './file1' not supported as upperdir EXT4-fs error (device loop4): ext4_evict_inode:307: comm syz-executor.4: couldn't truncate inode 3 (err -27) EXT4-fs warning (device loop4): ext4_enable_quotas:5876: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. EXT4-fs (loop4): Cannot turn on quotas: error -22 EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. GRED: DP 0 does not have a prio setting default to 8 overlayfs: unrecognized mount option "uyF3./file1" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "upperdirv/file1" or missing value netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: unrecognized mount option "upperdirv/file1" or missing value overlayfs: filesystem on './file1' not supported as upperdir overlayfs: unrecognized mount option "upperdiY=e" or missing value overlayfs: unrecognized mount option "upperdiY=e" or missing value BTRFS: device fsid f90cac8b-044b-4fa8-8bee-4b8d3da88dc2 devid 1 transid 7 /dev/loop4 overlayfs: unrecognized mount option "workdietacopy=on" or missing value BTRFS info (device loop4): turning on flush-on-commit overlayfs: unrecognized mount option "workdietacopy=on" or missing value BTRFS info (device loop4): disk space caching is enabled BTRFS info (device loop4): has skinny extents BTRFS info (device loop4): turning on flush-on-commit BTRFS info (device loop4): disk space caching is enabled BTRFS info (device loop4): has skinny extents overlayfs: failed to resolve './fpy=on': -2 Unknown ioctl -1060088316 Unknown ioctl 1074835048 Unknown ioctl -1072409080 IPVS: length: 74 != 8 Unknown ioctl 26124 Unknown ioctl -1060088316 Unknown ioctl 1074835048 overlayfs: filesystem on './file1' not supported as upperdir Unknown ioctl -1072409080 IPVS: length: 74 != 8 BTRFS info (device loop4): turning on flush-on-commit BTRFS info (device loop4): disk space caching is enabled BTRFS info (device loop4): has skinny extents overlayfs: unrecognized mount option "lowes" or missing value overlayfs: unrecognized mount option "lowes" or missing value overlayfs: filesystem on './file1' not supported as upperdir overlayfs: unrecognized mount option "" or missing value overlayfs: unrecognized mount option "" or missing value overlayfs: unrecognized mount option "Ypperdir=./fileiJ s8<0" or missing value BTRFS info (device loop4): turning on flush-on-commit BTRFS info (device loop4): disk space caching is enabled BTRFS info (device loop4): has skinny extents overlayfs: filesystem on './file1' not supported as upperdir overlayfs: filesystem on './file1' not supported as upperdir overlayfs: filesystem on './file1' not supported as upperdir overlayfs: filesystem on './file1' not supported as upperdir BTRFS info (device loop4): turning on flush-on-commit overlayfs: unrecognized mount option "wgrkdir=./file0" or missing value BTRFS info (device loop4): disk space caching is enabled BTRFS info (device loop4): has skinny extents overlayfs: unrecognized mount option "wgrkdir=./file0" or missing value overlayfs: missing 'lowerdir' overlayfs: unrecognized mount option "w5T)`)YFnA@T<3ڂ$rcnHwC" -8/" or missing value BTRFS info (device loop4): turning on flush-on-commit BTRFS info (device loop4): disk space caching is enabled overlayfs: filesystem on './file1' not supported as upperdir BTRFS info (device loop4): has skinny extents overlayfs: unrecognized mount option "metacopy=onP70P4f:~Z{?5X>@gU^6!#&PU \wR3 ca" or missing value overlayfs: unrecognized mount option "metacopy=onP70P4f:~Z{?5X>@gU^6!#&PU \wR3 ca" or missing value IPVS: stopping master sync thread 15408 ... batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device veth3 left promiscuous mode bridge0: port 3(veth3) entered disabled state device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode