====================================================== WARNING: possible circular locking dependency detected 6.4.0-syzkaller-12069-gc17414a273b8 #0 Not tainted ------------------------------------------------------ syz-executor.0/10344 is trying to acquire lock: ffff888025a081a0 (&iint->mutex){+.+.}-{3:3}, at: process_measurement+0x678/0x1940 security/integrity/ima/ima_main.c:266 but task is already holding lock: ffff8880747cc410 (sb_writers#4){.+.+}-{0:0}, at: do_open fs/namei.c:3629 [inline] ffff8880747cc410 (sb_writers#4){.+.+}-{0:0}, at: path_openat+0x1959/0x2710 fs/namei.c:3793 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sb_writers#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1494 [inline] sb_start_write include/linux/fs.h:1569 [inline] mnt_want_write+0x70/0x420 fs/namespace.c:403 ovl_maybe_copy_up+0x123/0x190 fs/overlayfs/copy_up.c:1135 ovl_open+0x15b/0x330 fs/overlayfs/file.c:167 do_dentry_open+0x6ce/0x17b0 fs/open.c:914 vfs_open fs/open.c:1048 [inline] dentry_open+0x13f/0x1d0 fs/open.c:1064 ima_calc_file_hash+0x2d0/0x4b0 security/integrity/ima/ima_crypto.c:558 ima_collect_measurement+0x5a8/0x6b0 security/integrity/ima/ima_api.c:289 process_measurement+0xd32/0x1940 security/integrity/ima/ima_main.c:345 ima_file_check+0xba/0x100 security/integrity/ima/ima_main.c:543 do_open fs/namei.c:3638 [inline] path_openat+0x1588/0x2710 fs/namei.c:3793 do_filp_open+0x1ba/0x410 fs/namei.c:3820 do_sys_openat2+0x160/0x1c0 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_compat_sys_openat fs/open.c:1482 [inline] __se_compat_sys_openat fs/open.c:1480 [inline] __ia32_compat_sys_openat+0x143/0x1f0 fs/open.c:1480 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #0 (&iint->mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 process_measurement+0x678/0x1940 security/integrity/ima/ima_main.c:266 ima_file_check+0xba/0x100 security/integrity/ima/ima_main.c:543 do_open fs/namei.c:3638 [inline] path_openat+0x1588/0x2710 fs/namei.c:3793 do_filp_open+0x1ba/0x410 fs/namei.c:3820 do_sys_openat2+0x160/0x1c0 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_compat_sys_open fs/open.c:1473 [inline] __se_compat_sys_open fs/open.c:1471 [inline] __ia32_compat_sys_open+0x11d/0x1c0 fs/open.c:1471 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_writers#4); lock(&iint->mutex); lock(sb_writers#4); lock(&iint->mutex); *** DEADLOCK *** 1 lock held by syz-executor.0/10344: #0: ffff8880747cc410 (sb_writers#4){.+.+}-{0:0}, at: do_open fs/namei.c:3629 [inline] #0: ffff8880747cc410 (sb_writers#4){.+.+}-{0:0}, at: path_openat+0x1959/0x2710 fs/namei.c:3793 stack backtrace: CPU: 0 PID: 10344 Comm: syz-executor.0 Not tainted 6.4.0-syzkaller-12069-gc17414a273b8 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x2df/0x3b0 kernel/locking/lockdep.c:2195 check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 process_measurement+0x678/0x1940 security/integrity/ima/ima_main.c:266 ima_file_check+0xba/0x100 security/integrity/ima/ima_main.c:543 do_open fs/namei.c:3638 [inline] path_openat+0x1588/0x2710 fs/namei.c:3793 do_filp_open+0x1ba/0x410 fs/namei.c:3820 do_sys_openat2+0x160/0x1c0 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_compat_sys_open fs/open.c:1473 [inline] __se_compat_sys_open fs/open.c:1471 [inline] __ia32_compat_sys_open+0x11d/0x1c0 fs/open.c:1471 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f8e579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f895cc EFLAGS: 00000296 ORIG_RAX: 0000000000000005 RAX: ffffffffffffffda RBX: 0000000020000180 RCX: 000000000014d27e RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 EXT4-fs error (device loop0): ext4_mb_generate_buddy:1209: group 0, block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 retq 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi