====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.4.5304/24138 is trying to acquire lock: ffff88807e3b0ab0 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_reset_action_flags security/integrity/ima/ima_main.c:709 [inline] ffff88807e3b0ab0 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_file_truncate+0xb6/0x170 security/integrity/ima/ima_main.c:724 but task is already holding lock: ffff888057c7c460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (sb_writers#5){.+.+}-{0:0}: percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs/super.h:19 [inline] sb_start_write+0x48/0x1c0 include/linux/fs/super.h:125 mnt_want_write+0x41/0x90 fs/namespace.c:531 ovl_fix_origin fs/overlayfs/namei.c:940 [inline] ovl_lookup_layers fs/overlayfs/namei.c:1180 [inline] ovl_lookup+0xb93/0x1c80 fs/overlayfs/namei.c:1403 lookup_open+0x94b/0x1970 fs/namei.c:4578 open_last_lookups fs/namei.c:4816 [inline] path_openat+0x70c/0x20f0 fs/namei.c:5055 do_file_open+0x258/0x570 fs/namei.c:5087 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_openat fs/open.c:1788 [inline] __se_sys_openat fs/open.c:1783 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1783 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (DCACHE_PAR_LOOKUP){+.+.}-{0:0}: d_wait_lookup fs/dcache.c:2840 [inline] __d_alloc_parallel+0xc32/0x1700 fs/dcache.c:2944 lookup_open+0x2c2/0x1970 fs/namei.c:4521 open_last_lookups fs/namei.c:4816 [inline] path_openat+0x70c/0x20f0 fs/namei.c:5055 do_file_open+0x258/0x570 fs/namei.c:5087 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_openat fs/open.c:1788 [inline] __se_sys_openat fs/open.c:1783 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1783 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&sb->s_type->i_mutex_key#27){++++}-{4:4}: down_read+0x45/0x320 kernel/locking/rwsem.c:1574 inode_lock_shared include/linux/fs.h:1039 [inline] exfat_file_read_iter+0xe7/0x220 fs/exfat/file.c:940 __kernel_read+0x4ca/0x960 fs/read_write.c:532 integrity_kernel_read+0x89/0xd0 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:222 [inline] ima_calc_file_hash+0x451/0x890 security/integrity/ima/ima_crypto.c:280 ima_collect_measurement+0x51b/0xa00 security/integrity/ima/ima_api.c:300 process_measurement+0x1272/0x1c10 security/integrity/ima/ima_main.c:425 ima_file_check+0xdc/0x130 security/integrity/ima/ima_main.c:686 security_file_post_open+0xb3/0x260 security/security.c:2801 do_open fs/namei.c:4895 [inline] path_openat+0x1748/0x20f0 fs/namei.c:5058 do_file_open+0x258/0x570 fs/namei.c:5087 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_openat fs/open.c:1788 [inline] __se_sys_openat fs/open.c:1783 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1783 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821 ima_reset_action_flags security/integrity/ima/ima_main.c:709 [inline] ima_file_truncate+0xb6/0x170 security/integrity/ima/ima_main.c:724 security_file_truncate+0x118/0x240 security/security.c:2817 handle_truncate fs/namei.c:4346 [inline] do_open fs/namei.c:4897 [inline] path_openat+0x1851/0x20f0 fs/namei.c:5058 do_file_open+0x258/0x570 fs/namei.c:5087 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_creat fs/open.c:1850 [inline] __se_sys_creat fs/open.c:1844 [inline] __x64_sys_creat+0x8f/0xc0 fs/open.c:1844 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &ima_iint_mutex_key[depth] --> DCACHE_PAR_LOOKUP --> sb_writers#5 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_writers#5); lock(DCACHE_PAR_LOOKUP); lock(sb_writers#5); lock(&ima_iint_mutex_key[depth]); *** DEADLOCK *** locks held by syz.4.5304/24138: 1, last CPU#0: #0: ffff888057c7c460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531 stack backtrace: CPU: 0 UID: 0 PID: 24138 Comm: syz.4.5304 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219 check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x197/0x15a0 kernel/locking/mutex.c:821 ima_reset_action_flags security/integrity/ima/ima_main.c:709 [inline] ima_file_truncate+0xb6/0x170 security/integrity/ima/ima_main.c:724 security_file_truncate+0x118/0x240 security/security.c:2817 handle_truncate fs/namei.c:4346 [inline] do_open fs/namei.c:4897 [inline] path_openat+0x1851/0x20f0 fs/namei.c:5058 do_file_open+0x258/0x570 fs/namei.c:5087 do_sys_openat2+0x115/0x200 fs/open.c:1442 do_sys_open fs/open.c:1448 [inline] __do_sys_creat fs/open.c:1850 [inline] __se_sys_creat fs/open.c:1844 [inline] __x64_sys_creat+0x8f/0xc0 fs/open.c:1844 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff01779e2d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff018715028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007ff017a26090 RCX: 00007ff01779e2d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080 RBP: 00007ff017835888 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff017a26128 R14: 00007ff017a26090 R15: 00007fff7dda98a8 kcov: kcov_task_exit: t = ffff8880352d5dc0, kcov->t = ffff8880352d5dc0