FAT-fs (loop4): Can't find a valid FAT filesystem overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop3): Can't find a valid FAT filesystem ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/17584 is trying to acquire lock: 00000000ed9f49eb (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] 00000000ed9f49eb (sb_writers#3){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 but task is already holding lock: 00000000513750ae (&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.0/17584: #0: 00000000513750ae (&iint->mutex){+.+.}, at: process_measurement+0x316/0x1440 security/integrity/ima/ima_main.c:224 stack backtrace: CPU: 0 PID: 17584 Comm: syz-executor.0 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: 0033:0x7f1c7220e5a9 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:00007f1c70781168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f1c7232ef80 RCX: 00007f1c7220e5a9 RDX: 0000000000000003 RSI: 0000000020000300 RDI: ffffffffffffff9c RBP: 00007f1c722697b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd61ea29ff R14: 00007f1c70781300 R15: 0000000000022000 overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. FAT-fs (loop1): Unrecognized mount option "ioch" or missing value FAT-fs (loop4): Unrecognized mount option "ioch" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. FAT-fs (loop2): Unrecognized mount option "ioch" or missing value overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. FAT-fs (loop3): bogus number of reserved sectors FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop2): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem FAT-fs (loop2): Can't find a valid FAT filesystem FAT-fs (loop3): Unrecognized mount option "ioch" or missing value FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: invalid redirect (./file0) overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: invalid redirect (./file0) audit: type=1804 audit(1666811037.840:83): pid=18001 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2372495815/syzkaller.S84Upj/298/bus/bus" dev="loop1" ino=6 res=1 attempt to access beyond end of device device batadv0 entered promiscuous mode loop1: rw=2049, want=68, limit=64 lo: Cannot use loopback or non-ethernet device as HSR slave. audit: type=1804 audit(1666811037.930:84): pid=18015 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2372495815/syzkaller.S84Upj/298/bus/bus" dev="loop1" ino=6 res=1 buffer_io_error: 8 callbacks suppressed Buffer I/O error on dev loop1, logical block 16, lost async page write device batadv0 left promiscuous mode audit: type=1804 audit(1666811038.130:85): pid=18038 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2158091630/syzkaller.b3JOvD/325/bus" dev="sda1" ino=14244 res=1 device batadv0 entered promiscuous mode audit: type=1804 audit(1666811038.190:86): pid=18042 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2372495815/syzkaller.S84Upj/299/bus/bus" dev="loop1" ino=7 res=1 audit: type=1804 audit(1666811038.220:87): pid=18051 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir2158091630/syzkaller.b3JOvD/325/bus" dev="sda1" ino=14244 res=1 lo: Cannot use loopback or non-ethernet device as HSR slave. attempt to access beyond end of device loop1: rw=2049, want=68, limit=64 audit: type=1804 audit(1666811038.280:88): pid=18053 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2372495815/syzkaller.S84Upj/299/bus/bus" dev="loop1" ino=7 res=1 Buffer I/O error on dev loop1, logical block 16, lost async page write device batadv0 left promiscuous mode attempt to access beyond end of device loop1: rw=2049, want=68, limit=64 Buffer I/O error on dev loop1, logical block 16, lost async page write audit: type=1804 audit(1666811038.460:89): pid=18059 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir88498655/syzkaller.YcjBPr/271/bus/bus" dev="loop2" ino=8 res=1 audit: type=1804 audit(1666811038.540:90): pid=18063 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir88498655/syzkaller.YcjBPr/271/bus/bus" dev="loop2" ino=8 res=1 attempt to access beyond end of device loop2: rw=2049, want=68, limit=64 Buffer I/O error on dev loop2, logical block 16, lost async page write attempt to access beyond end of device loop2: rw=2049, want=68, limit=64 device batadv0 entered promiscuous mode Buffer I/O error on dev loop2, logical block 16, lost async page write lo: Cannot use loopback or non-ethernet device as HSR slave. device batadv0 left promiscuous mode device batadv0 entered promiscuous mode lo: Cannot use loopback or non-ethernet device as HSR slave. device batadv0 left promiscuous mode audit: type=1804 audit(1666811038.850:91): pid=18081 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2372495815/syzkaller.S84Upj/300/bus" dev="sda1" ino=13959 res=1 audit: type=1804 audit(1666811038.940:92): pid=18074 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2372495815/syzkaller.S84Upj/300/bus" dev="sda1" ino=13959 res=1 attempt to access beyond end of device loop2: rw=2049, want=68, limit=64 Buffer I/O error on dev loop2, logical block 16, lost async page write attempt to access beyond end of device loop2: rw=2049, want=68, limit=64 Buffer I/O error on dev loop2, logical block 16, lost async page write attempt to access beyond end of device loop1: rw=2049, want=68, limit=64 Buffer I/O error on dev loop1, logical block 16, lost async page write