====================================================== WARNING: possible circular locking dependency detected 4.19.37 #5 Not tainted ------------------------------------------------------ syz-executor.1/7078 is trying to acquire lock: 00000000a7007a4c (&acct->lock#2){+.+.}, at: acct_pin_kill+0x27/0x100 kernel/acct.c:173 but task is already holding lock: 0000000048bf7013 (sb_writers#4){.+.+}, at: sb_start_write include/linux/fs.h:1569 [inline] 0000000048bf7013 (sb_writers#4){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (sb_writers#4){.+.+}: 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+0x20b/0x360 fs/super.c:1387 sb_start_write include/linux/fs.h:1569 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:24 ovl_rename+0x234/0x1870 fs/overlayfs/dir.c:1082 vfs_rename+0x803/0x1a70 fs/namei.c:4476 do_renameat2+0xb0f/0xc40 fs/namei.c:4626 __do_sys_renameat2 fs/namei.c:4661 [inline] __se_sys_renameat2 fs/namei.c:4658 [inline] __x64_sys_renameat2+0xbe/0x150 fs/namei.c:4658 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&ovl_i_mutex_key[depth]/4){+.+.}: down_write_nested+0x3c/0x90 kernel/locking/rwsem.c:192 inode_lock_nested include/linux/fs.h:773 [inline] lock_two_nondirectories+0xdd/0x120 fs/inode.c:1009 kobject: 'loop4' (0000000015217812): kobject_uevent_env vfs_rename+0x440/0x1a70 fs/namei.c:4450 kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' do_renameat2+0xb0f/0xc40 fs/namei.c:4626 __do_sys_renameat2 fs/namei.c:4661 [inline] __se_sys_renameat2 fs/namei.c:4658 [inline] __x64_sys_renameat2+0xbe/0x150 fs/namei.c:4658 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_key[depth]){+.+.}: down_write+0x38/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:738 [inline] ovl_write_iter+0x148/0xc20 fs/overlayfs/file.c:231 call_write_iter include/linux/fs.h:1811 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x58e/0x820 fs/read_write.c:487 __kernel_write+0x110/0x390 fs/read_write.c:506 do_acct_process+0xd37/0x1150 kernel/acct.c:520 acct_pin_kill+0x2f/0x100 kernel/acct.c:174 pin_kill+0x18f/0x860 fs/fs_pin.c:50 acct_on+0x574/0x790 kernel/acct.c:254 __do_sys_acct kernel/acct.c:286 [inline] __se_sys_acct kernel/acct.c:273 [inline] __x64_sys_acct+0xae/0x200 kernel/acct.c:273 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&acct->lock#2){+.+.}: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 acct_pin_kill+0x27/0x100 kernel/acct.c:173 pin_kill+0x18f/0x860 fs/fs_pin.c:50 acct_on+0x574/0x790 kernel/acct.c:254 __do_sys_acct kernel/acct.c:286 [inline] __se_sys_acct kernel/acct.c:273 [inline] __x64_sys_acct+0xae/0x200 kernel/acct.c:273 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &acct->lock#2 --> &ovl_i_mutex_key[depth]/4 --> sb_writers#4 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#4); lock(&ovl_i_mutex_key[depth]/4); lock(sb_writers#4); lock(&acct->lock#2); *** DEADLOCK *** 2 locks held by syz-executor.1/7078: #0: 000000009fd25677 (acct_on_mutex){+.+.}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: 000000009fd25677 (acct_on_mutex){+.+.}, at: __se_sys_acct kernel/acct.c:273 [inline] #0: 000000009fd25677 (acct_on_mutex){+.+.}, at: __x64_sys_acct+0xa6/0x200 kernel/acct.c:273 #1: 0000000048bf7013 (sb_writers#4){.+.+}, at: sb_start_write include/linux/fs.h:1569 [inline] #1: 0000000048bf7013 (sb_writers#4){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 stack backtrace: CPU: 0 PID: 7078 Comm: syz-executor.1 Not tainted 4.19.37 #5 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1861 [inline] check_prevs_add kernel/locking/lockdep.c:1974 [inline] validate_chain kernel/locking/lockdep.c:2415 [inline] __lock_acquire+0x2e6d/0x48f0 kernel/locking/lockdep.c:3411 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 acct_pin_kill+0x27/0x100 kernel/acct.c:173 pin_kill+0x18f/0x860 fs/fs_pin.c:50 acct_on+0x574/0x790 kernel/acct.c:254 __do_sys_acct kernel/acct.c:286 [inline] __se_sys_acct kernel/acct.c:273 [inline] __x64_sys_acct+0xae/0x200 kernel/acct.c:273 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007efeec301c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000458da9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000440 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007efeec3026d4 R13: 00000000004becd2 R14: 00000000004cfa50 R15: 00000000ffffffff kobject: 'batman_adv' (000000008af9490a): kobject_uevent_env audit: type=1804 audit(1556466721.895:346): pid=7078 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir261768234/syzkaller.KZLYdQ/1287/file0" dev="sda1" ino=17001 res=1 kobject: 'batman_adv' (000000008af9490a): kobject_uevent_env: filter function caused the event to drop! kobject: 'batman_adv' (000000008af9490a): kobject_cleanup, parent (null) Process accounting resumed kobject: 'batman_adv' (000000008af9490a): calling ktype release kobject: (000000008af9490a): dynamic_kobj_release kobject: 'batman_adv': free name kobject: 'rx-0' (000000006756ead1): kobject_cleanup, parent 000000003b33cad1 kobject: 'rx-0' (000000006756ead1): auto cleanup 'remove' event kobject: 'rx-0' (000000006756ead1): kobject_uevent_env kobject: 'rx-0' (000000006756ead1): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/rx-0' kobject: 'rx-0' (000000006756ead1): auto cleanup kobject_del kobject: 'rx-0' (000000006756ead1): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (00000000d20580b4): kobject_cleanup, parent 000000003b33cad1 kobject: 'tx-0' (00000000d20580b4): auto cleanup 'remove' event kobject: 'tx-0' (00000000d20580b4): kobject_uevent_env kobject: 'tx-0' (00000000d20580b4): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/tx-0' kobject: 'tx-0' (00000000d20580b4): auto cleanup kobject_del kobject: 'tx-0' (00000000d20580b4): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (000000003b33cad1): kobject_cleanup, parent (null) kobject: 'queues' (000000003b33cad1): calling ktype release kobject: 'queues' (000000003b33cad1): kset_release kobject: 'queues': free name kobject: 'nr0' (00000000d1e24eb8): kobject_uevent_env kobject: 'nr0' (00000000d1e24eb8): fill_kobj_path: path = '/devices/virtual/net/nr0' kobject: 'nr0' (00000000d1e24eb8): kobject_cleanup, parent (null) kobject: 'nr0' (00000000d1e24eb8): calling ktype release kobject: 'nr0': free name kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' caif:caif_disconnect_client(): nothing to disconnect kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' caif:caif_disconnect_client(): nothing to disconnect kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' net_ratelimit: 20 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env net_ratelimit: 20 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (00000000349488ac): kobject_uevent_env kobject: 'loop3' (00000000349488ac): fill_kobj_path: path = '/devices/virtual/block/loop3' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop4' (0000000015217812): kobject_uevent_env kobject: 'loop4' (0000000015217812): fill_kobj_path: path = '/devices/virtual/block/loop4' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1