audit: type=1800 audit(1677480660.451:1395): pid=22971 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=14655 res=0 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/22966 is trying to acquire lock: 00000000557b3b18 (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] 00000000557b3b18 (sb_writers#3){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 but task is already holding lock: 000000004f466ee0 (&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.3/22966: #0: 000000004f466ee0 (&iint->mutex){+.+.}, at: process_measurement+0x316/0x1440 security/integrity/ima/ima_main.c:224 stack backtrace: CPU: 0 PID: 22966 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 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: 0033:0x7f0f0305c0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0f015ce168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f0f0317bf80 RCX: 00007f0f0305c0f9 RDX: 0000000000008003 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 00007f0f030b7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdce1670ef R14: 00007f0f015ce300 R15: 0000000000022000 overlayfs: unrecognized mount option "workdyr=./file1" or missing value audit: type=1800 audit(1677480661.291:1396): pid=22994 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13962 res=0 overlayfs: unrecognized mount option "lowmrdir=." or missing value overlayfs: unrecognized mount option "lowmrdir=." or missing value BTRFS: device fsid 395ef67a-297e-477c-816d-cd80a5b93e5d devid 1 transid 8 /dev/loop1 kauditd_printk_skb: 2 callbacks suppressed audit: type=1800 audit(1677480661.761:1399): pid=23099 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=14011 res=0 BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed overlayfs: unrecognized mount option "lowmrdir=." or missing value audit: type=1804 audit(1677480662.021:1400): pid=23132 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3148740702/syzkaller.BiQf01/389/bus/file0" dev="sda1" ino=13950 res=1 BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed audit: type=1800 audit(1677480662.551:1401): pid=23205 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13977 res=0 overlayfs: conflicting lowerdir path audit: type=1800 audit(1677480662.551:1402): pid=23205 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13977 res=0 overlayfs: unrecognized mount option "uppurdir=./bus" or missing value audit: type=1800 audit(1677480662.551:1403): pid=23205 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13977 res=0 audit: type=1800 audit(1677480662.551:1404): pid=23205 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13977 res=0 audit: type=1800 audit(1677480662.551:1405): pid=23205 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13977 res=0 BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed audit: type=1800 audit(1677480662.551:1406): pid=23205 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13977 res=0 audit: type=1800 audit(1677480662.551:1407): pid=23205 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13977 res=0 audit: type=1800 audit(1677480662.561:1408): pid=23205 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=13977 res=0 overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: failed to resolve './bus': -40 BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 BTRFS error (device loop1): unsupported checksum algorithm 2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 BTRFS error (device loop1): superblock checksum mismatch overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 BTRFS error (device loop1): open_ctree failed overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 Unknown ioctl 26130 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 Unknown ioctl 26130 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 Unknown ioctl 26130 overlayfs: failed to resolve './bus': -2 BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed 9pnet: Insufficient options for proto=fd overlayfs: failed to resolve './bus': -40 kauditd_printk_skb: 33 callbacks suppressed audit: type=1804 audit(1677480667.112:1442): pid=23628 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3148740702/syzkaller.BiQf01/404/bus/file0" dev="overlay" ino=14820 res=1 audit: type=1804 audit(1677480667.122:1443): pid=23626 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir3148740702/syzkaller.BiQf01/404/bus/file0" dev="overlay" ino=14820 res=1 overlayfs: filesystem on './bus' not supported as upperdir 9pnet: Insufficient options for proto=fd BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed overlayfs: failed to resolve './file1': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd overlayfs: failed to resolve './bus': -2 9pnet: Insufficient options for proto=fd overlayfs: failed to resolve './bus': -2 BTRFS error (device loop1): unsupported checksum algorithm 2 overlayfs: failed to resolve './bus': -2 9pnet: Insufficient options for proto=fd BTRFS error (device loop1): superblock checksum mismatch 9pnet: Insufficient options for proto=fd overlayfs: failed to resolve './bus': -2 9pnet: Insufficient options for proto=fd overlayfs: failed to resolve './bus': -2 9pnet: Insufficient options for proto=fd BTRFS error (device loop1): open_ctree failed overlayfs: failed to resolve './bus': -2 9pnet: Insufficient options for proto=fd overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 9pnet: Insufficient options for proto=fd overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: failed to resolve './bus': -2 overlayfs: unrecognized mount option "b@ïupperdir=./bus" or missing value overlayfs: unrecognized mount option "b@ïupperdir=./bus" or missing value audit: type=1800 audit(1677480668.302:1444): pid=23740 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14379 res=0 BTRFS error (device loop1): unsupported checksum algorithm 2 BTRFS error (device loop1): superblock checksum mismatch BTRFS error (device loop1): open_ctree failed audit: type=1804 audit(1677480668.602:1445): pid=23780 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2937358252/syzkaller.MK9HWD/337/bus/file0" dev="sda1" ino=14703 res=1 overlayfs: unrecognized mount option "b@ïupperdir=./bus" or missing value audit: type=1804 audit(1677480668.662:1446): pid=23789 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3148740702/syzkaller.BiQf01/410/file0" dev="sda1" ino=14352 res=1 overlayfs: conflicting lowerdir path audit: type=1804 audit(1677480668.902:1447): pid=23824 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir3148740702/syzkaller.BiQf01/412/file0" dev="sda1" ino=13980 res=1 overlayfs: unrecognized mount option "workdiwerdA¼?α–³‹BËKir=." or missing value audit: type=1804 audit(1677480669.732:1448): pid=23865 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir3148740702/syzkaller.BiQf01/413/bus/file0" dev="overlay" ino=14720 res=1 overlayfs: unrecognized mount option "workdiwerdA¼?α–³‹BËKir=." or missing value overlayfs: unrecognized mount option "workdiwerdA¼?α–³‹BËKir=." or missing value netlink: 'syz-executor.2': attribute type 14 has an invalid length. device veth0_vlan left promiscuous mode