dlm: non-version read from control device 78 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/16349 is trying to acquire lock: 0000000063486090 (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] 0000000063486090 (sb_writers#3){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 but task is already holding lock: 000000006db0a9ae (&iint->mutex){+.+.}, at: process_measurement+0x316/0x1440 security/integrity/ima/ima_main.c:224 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&iint->mutex){+.+.}: process_measurement+0x316/0x1440 security/integrity/ima/ima_main.c:224 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (sb_writers#3){.+.+}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x6e/0x2a0 fs/super.c:1366 sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_maybe_copy_up+0x11f/0x190 fs/overlayfs/copy_up.c:888 ovl_open+0xb4/0x260 fs/overlayfs/file.c:126 do_dentry_open+0x4aa/0x1160 fs/open.c:796 vfs_open fs/open.c:902 [inline] dentry_open+0x132/0x1d0 fs/open.c:918 ima_calc_file_hash+0x628/0x8a0 security/integrity/ima/ima_crypto.c:435 ima_collect_measurement+0x4c4/0x570 security/integrity/ima/ima_api.c:231 process_measurement+0xddd/0x1440 security/integrity/ima/ima_main.c:284 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 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: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&iint->mutex); lock(sb_writers#3); lock(&iint->mutex); lock(sb_writers#3); *** DEADLOCK *** 1 lock held by syz-executor.4/16349: #0: 000000006db0a9ae (&iint->mutex){+.+.}, at: process_measurement+0x316/0x1440 security/integrity/ima/ima_main.c:224 stack backtrace: CPU: 1 PID: 16349 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x6e/0x2a0 fs/super.c:1366 sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_maybe_copy_up+0x11f/0x190 fs/overlayfs/copy_up.c:888 ovl_open+0xb4/0x260 fs/overlayfs/file.c:126 do_dentry_open+0x4aa/0x1160 fs/open.c:796 vfs_open fs/open.c:902 [inline] dentry_open+0x132/0x1d0 fs/open.c:918 ima_calc_file_hash+0x628/0x8a0 security/integrity/ima/ima_crypto.c:435 ima_collect_measurement+0x4c4/0x570 security/integrity/ima/ima_api.c:231 process_measurement+0xddd/0x1440 security/integrity/ima/ima_main.c:284 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f23045d15a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2302b44168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f23046f1f80 RCX: 00007f23045d15a9 RDX: 0000000000000000 RSI: 000000000000007f RDI: 0000000020000180 RBP: 00007f230462c7b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcc4750dff R14: 00007f2302b44300 R15: 0000000000022000 dlm: non-version read from control device 78 kauditd_printk_skb: 1 callbacks suppressed audit: type=1800 audit(1666801374.526:43): pid=16402 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="file0" dev="sda1" ino=14047 res=0 squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on nullb0 UBIFS error (pid: 16415): cannot open "/", error -22 BFS-fs: bfs_fill_super(): No BFS filesystem on nullb0 (magic=000000ff) ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 audit: type=1804 audit(1666801375.456:44): pid=16454 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2869461050/syzkaller.P3s4TP/341/file0/bus" dev="loop2" ino=7 res=1 BFS-fs: bfs_fill_super(): No BFS filesystem on nullb0 (magic=00000000) audit: type=1800 audit(1666801375.456:45): pid=16454 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="loop2" ino=7 res=0 squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on nullb0 audit: type=1804 audit(1666801375.736:46): pid=16484 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2869461050/syzkaller.P3s4TP/342/file0/bus" dev="loop2" ino=7 res=1 audit: type=1800 audit(1666801375.736:47): pid=16484 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="loop2" ino=7 res=0 audit: type=1804 audit(1666801375.886:48): pid=16492 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3796035573/syzkaller.TsuqT8/392/file0/bus" dev="loop3" ino=7 res=1 BFS-fs: bfs_fill_super(): No BFS filesystem on nullb0 (magic=00000000) audit: type=1800 audit(1666801375.916:49): pid=16492 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="loop3" ino=7 res=0 audit: type=1804 audit(1666801375.916:50): pid=16494 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir1765690304/syzkaller.LWFKes/357/file0/bus" dev="loop0" ino=7 res=1 audit: type=1800 audit(1666801375.916:51): pid=16494 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="loop0" ino=7 res=0 BFS-fs: bfs_fill_super(): No BFS filesystem on nullb0 (magic=00000000) audit: type=1804 audit(1666801376.146:52): pid=16521 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2869461050/syzkaller.P3s4TP/343/bus" dev="sda1" ino=13923 res=1 block nbd1: Attempted send on invalid socket print_req_error: I/O error, dev nbd1, sector 0 efs: cannot read volume header block nbd1: Attempted send on invalid socket print_req_error: I/O error, dev nbd1, sector 0 efs: cannot read volume header vxfs: WRONG superblock magic 00000000 at 1 vxfs: unable to read disk superblock at 8 vxfs: can't find superblock. block nbd1: Attempted send on invalid socket print_req_error: I/O error, dev nbd1, sector 0 efs: cannot read volume header block nbd1: Attempted send on invalid socket print_req_error: I/O error, dev nbd1, sector 0 efs: cannot read volume header vxfs: WRONG superblock magic 00000000 at 1 vxfs: unable to read disk superblock at 8 vxfs: can't find superblock. EXT4-fs (loop0): corrupt root inode, run e2fsck EXT4-fs (loop0): mount failed CIFS VFS: Device name not specified. CIFS VFS: Malformed UNC in devname. vxfs: WRONG superblock magic 00000000 at 1 vxfs: unable to read disk superblock at 8 vxfs: can't find superblock. EXT4-fs (loop0): corrupt root inode, run e2fsck EXT4-fs (loop0): mount failed vxfs: WRONG superblock magic 00000000 at 1 vxfs: unable to read disk superblock at 8 vxfs: can't find superblock. EXT4-fs (loop0): corrupt root inode, run e2fsck EXT4-fs (loop0): mount failed EXT4-fs (loop0): corrupt root inode, run e2fsck EXT4-fs (loop0): mount failed print_req_error: I/O error, dev loop4, sector 0 EXT4-fs warning (device sda1): ext4_resize_begin:72: There are errors in the filesystem, so online resizing is not allowed overlayfs: missing 'lowerdir' 9pnet_virtio: no channels available for device ./file0 ceph: device name is missing path (no : separator in ./file0/file0) ceph: device name is missing path (no : separator in ./file0/file0) ceph: device name is missing path (no : separator in ./file0/file0) ceph: device name is missing path (no : separator in ./file0/file0) netlink: 3 bytes leftover after parsing attributes in process `syz-executor.1'. pci 0000:00:05.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=io+mem netlink: 16 bytes leftover after parsing attributes in process `syz-executor.3'. pci 0000:00:05.0: vgaarb: changed VGA decodes: olddecodes=none,decodes=none:owns=io+mem pci 0000:00:05.0: vgaarb: changed VGA decodes: olddecodes=none,decodes=none:owns=io+mem pci 0000:00:05.0: vgaarb: changed VGA decodes: olddecodes=none,decodes=none:owns=io+mem kauditd_printk_skb: 13 callbacks suppressed audit: type=1804 audit(1666801382.757:66): pid=17374 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir2869461050/syzkaller.P3s4TP/391/cgroup.controllers" dev="sda1" ino=14361 res=1