Hello, syzbot found the following issue on: HEAD commit: 940fcc189c51 Add linux-next specific files for 20230921 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12dea70e680000 kernel config: https://syzkaller.appspot.com/x/.config?x=1f140ae6e669ac24 dashboard link: https://syzkaller.appspot.com/bug?extid=e8628856801e9809216f compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b8921b235c24/disk-940fcc18.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c80a9f6bcdd4/vmlinux-940fcc18.xz kernel image: https://storage.googleapis.com/syzbot-assets/ed10a4df6950/bzImage-940fcc18.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e8628856801e9809216f@xxxxxxxxxxxxxxxxxxxxxxxxx ====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc2-next-20230921-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/15498 is trying to acquire lock: ffff88808e717968 (&ovl_i_lock_key[depth]#2){+.+.}-{3:3}, at: ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:630 [inline] ffff88808e717968 (&ovl_i_lock_key[depth]#2){+.+.}-{3:3}, at: ovl_copy_up_start+0x4d/0x290 fs/overlayfs/util.c:692 but task is already holding lock: ffff88801d8b13e0 (&iint->mutex){+.+.}-{3:3}, at: process_measurement+0x893/0x1cc0 security/integrity/ima/ima_main.c:266 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&iint->mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x181/0x1340 kernel/locking/mutex.c:747 process_measurement+0x893/0x1cc0 security/integrity/ima/ima_main.c:266 ima_file_check+0xc2/0x110 security/integrity/ima/ima_main.c:543 do_open fs/namei.c:3622 [inline] path_openat+0x17a1/0x29c0 fs/namei.c:3777 do_filp_open+0x1de/0x430 fs/namei.c:3804 do_sys_openat2+0x176/0x1e0 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_open fs/open.c:1445 [inline] __se_sys_open fs/open.c:1441 [inline] __x64_sys_open+0x154/0x1e0 fs/open.c:1441 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (sb_writers#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1572 [inline] sb_start_write include/linux/fs.h:1647 [inline] ovl_start_write+0xfe/0x2d0 fs/overlayfs/util.c:31 ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:830 [inline] ovl_do_copy_up fs/overlayfs/copy_up.c:945 [inline] ovl_copy_up_one+0x16a5/0x3250 fs/overlayfs/copy_up.c:1137 ovl_copy_up_flags+0x189/0x200 fs/overlayfs/copy_up.c:1192 ovl_xattr_set+0x387/0x4e0 fs/overlayfs/xattrs.c:56 __vfs_setxattr+0x173/0x1d0 fs/xattr.c:201 __vfs_setxattr_noperm+0x127/0x5e0 fs/xattr.c:235 __vfs_setxattr_locked+0x17e/0x250 fs/xattr.c:296 vfs_setxattr+0x146/0x350 fs/xattr.c:322 do_setxattr+0x142/0x170 fs/xattr.c:630 setxattr+0x159/0x170 fs/xattr.c:653 path_setxattr+0x1a3/0x1d0 fs/xattr.c:672 __do_sys_setxattr fs/xattr.c:688 [inline] __se_sys_setxattr fs/xattr.c:684 [inline] __x64_sys_setxattr+0xc4/0x160 fs/xattr.c:684 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&ovl_i_lock_key[depth]#2){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x181/0x1340 kernel/locking/mutex.c:747 ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:630 [inline] ovl_copy_up_start+0x4d/0x290 fs/overlayfs/util.c:692 ovl_copy_up_one+0x598/0x3250 fs/overlayfs/copy_up.c:1130 ovl_copy_up_flags+0x189/0x200 fs/overlayfs/copy_up.c:1192 ovl_maybe_copy_up+0x124/0x160 fs/overlayfs/copy_up.c:1222 ovl_open+0x16f/0x330 fs/overlayfs/file.c:166 do_dentry_open+0x88b/0x1730 fs/open.c:929 vfs_open fs/open.c:1063 [inline] dentry_open+0x13f/0x1d0 fs/open.c:1079 ima_calc_file_hash+0x2c4/0x4a0 security/integrity/ima/ima_crypto.c:558 ima_collect_measurement+0x5e2/0x6f0 security/integrity/ima/ima_api.c:289 process_measurement+0xc87/0x1cc0 security/integrity/ima/ima_main.c:345 ima_file_check+0xc2/0x110 security/integrity/ima/ima_main.c:543 do_open fs/namei.c:3622 [inline] path_openat+0x17a1/0x29c0 fs/namei.c:3777 do_filp_open+0x1de/0x430 fs/namei.c:3804 do_sys_openat2+0x176/0x1e0 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1448 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: &ovl_i_lock_key[depth]#2 --> sb_writers#4 --> &iint->mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&iint->mutex); lock(sb_writers#4); lock(&iint->mutex); lock(&ovl_i_lock_key[depth]#2); *** DEADLOCK *** 1 lock held by syz-executor.3/15498: #0: ffff88801d8b13e0 (&iint->mutex){+.+.}-{3:3}, at: process_measurement+0x893/0x1cc0 security/integrity/ima/ima_main.c:266 stack backtrace: CPU: 0 PID: 15498 Comm: syz-executor.3 Not tainted 6.6.0-rc2-next-20230921-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x311/0x3f0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x181/0x1340 kernel/locking/mutex.c:747 ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:630 [inline] ovl_copy_up_start+0x4d/0x290 fs/overlayfs/util.c:692 ovl_copy_up_one+0x598/0x3250 fs/overlayfs/copy_up.c:1130 ovl_copy_up_flags+0x189/0x200 fs/overlayfs/copy_up.c:1192 ovl_maybe_copy_up+0x124/0x160 fs/overlayfs/copy_up.c:1222 ovl_open+0x16f/0x330 fs/overlayfs/file.c:166 do_dentry_open+0x88b/0x1730 fs/open.c:929 vfs_open fs/open.c:1063 [inline] dentry_open+0x13f/0x1d0 fs/open.c:1079 ima_calc_file_hash+0x2c4/0x4a0 security/integrity/ima/ima_crypto.c:558 ima_collect_measurement+0x5e2/0x6f0 security/integrity/ima/ima_api.c:289 process_measurement+0xc87/0x1cc0 security/integrity/ima/ima_main.c:345 ima_file_check+0xc2/0x110 security/integrity/ima/ima_main.c:543 do_open fs/namei.c:3622 [inline] path_openat+0x17a1/0x29c0 fs/namei.c:3777 do_filp_open+0x1de/0x430 fs/namei.c:3804 do_sys_openat2+0x176/0x1e0 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1448 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f30bf67cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f30c03990c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f30bf79c050 RCX: 00007f30bf67cae9 RDX: 0000000000008443 RSI: 0000000020004280 RDI: ffffffffffffff9c RBP: 00007f30bf6c847a R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000cc R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f30bf79c050 R15: 00007ffce77ebe68 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
