====================================================== WARNING: possible circular locking dependency detected 5.15.139-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/15251 is trying to acquire lock: ffff888024d40460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 but task is already holding lock: ffff888023770500 (&iint->mutex){+.+.}-{3:3}, at: process_measurement+0x733/0x1d60 security/integrity/ima/ima_main.c:260 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&iint->mutex){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 process_measurement+0x733/0x1d60 security/integrity/ima/ima_main.c:260 ima_file_check+0xf3/0x180 security/integrity/ima/ima_main.c:519 do_open fs/namei.c:3540 [inline] path_openat+0x2745/0x2f20 fs/namei.c:3672 do_filp_open+0x21c/0x460 fs/namei.c:3699 do_sys_openat2+0x13b/0x500 fs/open.c:1211 do_sys_open fs/open.c:1227 [inline] __do_sys_open fs/open.c:1235 [inline] __se_sys_open fs/open.c:1231 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1231 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #0 (sb_writers#5){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1742 [inline] sb_start_write+0x4f/0x1c0 include/linux/fs.h:1812 mnt_want_write+0x3b/0x80 fs/namespace.c:377 ovl_maybe_copy_up+0x111/0x180 fs/overlayfs/copy_up.c:1077 ovl_open+0xa4/0x200 fs/overlayfs/file.c:149 do_dentry_open+0x807/0xfb0 fs/open.c:826 vfs_open fs/open.c:956 [inline] dentry_open+0xc6/0x120 fs/open.c:972 ima_calc_file_hash+0x15f/0x1c00 security/integrity/ima/ima_crypto.c:558 ima_collect_measurement+0x293/0x530 security/integrity/ima/ima_api.c:254 process_measurement+0x1038/0x1d60 security/integrity/ima/ima_main.c:337 ima_file_check+0xf3/0x180 security/integrity/ima/ima_main.c:519 do_open fs/namei.c:3540 [inline] path_openat+0x2745/0x2f20 fs/namei.c:3672 do_filp_open+0x21c/0x460 fs/namei.c:3699 do_sys_openat2+0x13b/0x500 fs/open.c:1211 do_sys_open fs/open.c:1227 [inline] __do_sys_openat fs/open.c:1243 [inline] __se_sys_openat fs/open.c:1238 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1238 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&iint->mutex); lock(sb_writers#5); lock(&iint->mutex); lock(sb_writers#5); *** DEADLOCK *** 1 lock held by syz-executor.4/15251: #0: ffff888023770500 (&iint->mutex){+.+.}-{3:3}, at: process_measurement+0x733/0x1d60 security/integrity/ima/ima_main.c:260 stack backtrace: CPU: 1 PID: 15251 Comm: syz-executor.4 Not tainted 5.15.139-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1742 [inline] sb_start_write+0x4f/0x1c0 include/linux/fs.h:1812 mnt_want_write+0x3b/0x80 fs/namespace.c:377 ovl_maybe_copy_up+0x111/0x180 fs/overlayfs/copy_up.c:1077 ovl_open+0xa4/0x200 fs/overlayfs/file.c:149 do_dentry_open+0x807/0xfb0 fs/open.c:826 vfs_open fs/open.c:956 [inline] dentry_open+0xc6/0x120 fs/open.c:972 ima_calc_file_hash+0x15f/0x1c00 security/integrity/ima/ima_crypto.c:558 ima_collect_measurement+0x293/0x530 security/integrity/ima/ima_api.c:254 process_measurement+0x1038/0x1d60 security/integrity/ima/ima_main.c:337 ima_file_check+0xf3/0x180 security/integrity/ima/ima_main.c:519 do_open fs/namei.c:3540 [inline] path_openat+0x2745/0x2f20 fs/namei.c:3672 do_filp_open+0x21c/0x460 fs/namei.c:3699 do_sys_openat2+0x13b/0x500 fs/open.c:1211 do_sys_open fs/open.c:1227 [inline] __do_sys_openat fs/open.c:1243 [inline] __se_sys_openat fs/open.c:1238 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1238 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7feafd150ae9 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:00007feafb6d20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007feafd26ff80 RCX: 00007feafd150ae9 RDX: 0000000000000003 RSI: 0000000020000000 RDI: ffffffffffffff9c RBP: 00007feafd19c47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007feafd26ff80 R15: 00007fff2751f1c8