====================================================== WARNING: possible circular locking dependency detected 4.19.37 #5 Not tainted ------------------------------------------------------ syz-executor.3/17572 is trying to acquire lock: 00000000ecadaa38 (&acct->lock#2){+.+.}, at: acct_pin_kill+0x27/0x100 kernel/acct.c:173 but task is already holding lock: 00000000b4312c94 (sb_writers#4){.+.+}, at: sb_start_write include/linux/fs.h:1569 [inline] 00000000b4312c94 (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: -> #2 (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_do_remove+0xf8/0xd90 fs/overlayfs/dir.c:843 ovl_unlink+0x18/0x20 fs/overlayfs/dir.c:888 vfs_unlink+0x2d8/0x500 fs/namei.c:3999 do_unlinkat+0x3f7/0x6d0 fs/namei.c:4062 __do_sys_unlink fs/namei.c:4109 [inline] __se_sys_unlink fs/namei.c:4107 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4107 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 slow_acct_process kernel/acct.c:579 [inline] acct_process+0x568/0x61e kernel/acct.c:605 do_exit+0x17c0/0x2fa0 kernel/exit.c:866 do_group_exit+0x135/0x370 kernel/exit.c:979 get_signal+0x399/0x1d50 kernel/signal.c:2572 do_signal+0x95/0x1950 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 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] --> sb_writers#4 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#4); lock(&ovl_i_mutex_key[depth]); lock(sb_writers#4); lock(&acct->lock#2); *** DEADLOCK *** 2 locks held by syz-executor.3/17572: #0: 00000000ca41bdf0 (acct_on_mutex){+.+.}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: 00000000ca41bdf0 (acct_on_mutex){+.+.}, at: __se_sys_acct kernel/acct.c:273 [inline] #0: 00000000ca41bdf0 (acct_on_mutex){+.+.}, at: __x64_sys_acct+0xa6/0x200 kernel/acct.c:273 #1: 00000000b4312c94 (sb_writers#4){.+.+}, at: sb_start_write include/linux/fs.h:1569 [inline] #1: 00000000b4312c94 (sb_writers#4){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 stack backtrace: CPU: 1 PID: 17572 Comm: syz-executor.3 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:00007fcbe5a26c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000458da9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcbe5a276d4 R13: 00000000004becd2 R14: 00000000004cfa50 R15: 00000000ffffffff kobject: 'rx-0' (00000000281a60cc): kobject_cleanup, parent 00000000e52ae049 kobject: 'rx-0' (00000000281a60cc): auto cleanup 'remove' event kobject: 'rx-0' (00000000281a60cc): kobject_uevent_env kobject: 'rx-0' (00000000281a60cc): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (00000000281a60cc): auto cleanup kobject_del kobject: 'rx-0' (00000000281a60cc): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (0000000038b27858): kobject_cleanup, parent 00000000e52ae049 kobject: 'tx-0' (0000000038b27858): auto cleanup 'remove' event kobject: 'tx-0' (0000000038b27858): kobject_uevent_env kobject: 'tx-0' (0000000038b27858): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'loop0' (0000000007bea631): kobject_uevent_env kobject: 'loop0' (0000000007bea631): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'tx-0' (0000000038b27858): auto cleanup kobject_del kobject: 'tx-0' (0000000038b27858): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (00000000e52ae049): kobject_cleanup, parent (null) kobject: 'queues' (00000000e52ae049): calling ktype release kobject: 'queues' (00000000e52ae049): kset_release kobject: 'queues': free name kobject: 'ip6gre0' (0000000008d56b23): kobject_uevent_env kobject: 'ip6gre0' (0000000008d56b23): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (0000000075eb3d95): kobject_cleanup, parent 00000000b11be878 Process accounting resumed kobject: 'rx-0' (0000000075eb3d95): auto cleanup 'remove' event audit: type=1804 audit(2000001151.132:856): pid=7902 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.3" name="/root/syzkaller-testdir171670947/syzkaller.kNK7Ro/2759/file0" dev="sda1" ino=16682 res=1 kobject: 'loop2' (0000000098216ca2): kobject_uevent_env kobject: 'loop2' (0000000098216ca2): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'rx-0' (0000000075eb3d95): kobject_uevent_env kobject: 'rx-0' (0000000075eb3d95): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (0000000075eb3d95): auto cleanup kobject_del kobject: 'rx-0' (0000000075eb3d95): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (0000000012e70713): kobject_cleanup, parent 00000000b11be878 kobject: 'tx-0' (0000000012e70713): auto cleanup 'remove' event kobject: 'tx-0' (0000000012e70713): kobject_uevent_env kobject: 'tx-0' (0000000012e70713): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (0000000012e70713): auto cleanup kobject_del kobject: 'tx-0' (0000000012e70713): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (00000000b11be878): kobject_cleanup, parent (null) kobject: 'queues' (00000000b11be878): calling ktype release kobject: 'loop4' (00000000662bd41c): kobject_uevent_env kobject: 'queues' (00000000b11be878): kset_release kobject: 'queues': free name kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'ip6gre0' (00000000589d67e0): kobject_uevent_env kobject: 'ip6gre0' (00000000589d67e0): kobject_uevent_env: uevent_suppress caused the event to drop! FAT-fs (loop4): bogus number of reserved sectors kobject: 'rx-0' (0000000081ded52b): kobject_cleanup, parent 0000000054689630 kobject: 'loop2' (0000000098216ca2): kobject_uevent_env kobject: 'loop2' (0000000098216ca2): fill_kobj_path: path = '/devices/virtual/block/loop2' FAT-fs (loop4): Can't find a valid FAT filesystem kobject: 'rx-0' (0000000081ded52b): auto cleanup 'remove' event kobject: 'rx-0' (0000000081ded52b): kobject_uevent_env kobject: 'loop4' (00000000662bd41c): kobject_uevent_env kobject: 'rx-0' (0000000081ded52b): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'rx-0' (0000000081ded52b): auto cleanup kobject_del kobject: 'rx-0' (0000000081ded52b): calling ktype release kobject: 'rx-0': free name kobject: 'loop4' (00000000662bd41c): kobject_uevent_env kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'tx-0' (0000000033e9f3b2): kobject_cleanup, parent 0000000054689630 kobject: 'tx-0' (0000000033e9f3b2): auto cleanup 'remove' event kobject: 'tx-0' (0000000033e9f3b2): kobject_uevent_env kobject: 'tx-0' (0000000033e9f3b2): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (0000000033e9f3b2): auto cleanup kobject_del kobject: 'tx-0' (0000000033e9f3b2): calling ktype release kobject: 'tx-0': free name kobject: 'loop4' (00000000662bd41c): kobject_uevent_env kobject: 'queues' (0000000054689630): kobject_cleanup, parent (null) kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'queues' (0000000054689630): calling ktype release kobject: 'queues' (0000000054689630): kset_release kobject: 'queues': free name kobject: 'ip6gre0' (0000000008d4a822): kobject_uevent_env kobject: 'ip6gre0' (0000000008d4a822): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'loop2' (0000000098216ca2): kobject_uevent_env kobject: 'loop2' (0000000098216ca2): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'ip6gre0' (0000000008d56b23): kobject_cleanup, parent (null) kobject: 'ip6gre0' (0000000008d56b23): auto cleanup 'remove' event kobject: 'ip6gre0' (0000000008d56b23): kobject_uevent_env kobject: 'loop0' (0000000007bea631): kobject_uevent_env kobject: 'loop0' (0000000007bea631): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'ip6gre0' (0000000008d56b23): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'loop4' (00000000662bd41c): kobject_uevent_env kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'ip6gre0' (0000000008d56b23): calling ktype release FAT-fs (loop4): bogus number of reserved sectors kobject: 'ip6gre0': free name FAT-fs (loop4): Can't find a valid FAT filesystem kobject: 'ip6gre0' (00000000589d67e0): kobject_cleanup, parent (null) kobject: 'loop4' (00000000662bd41c): kobject_uevent_env kobject: 'ip6gre0' (00000000589d67e0): auto cleanup 'remove' event kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'ip6gre0' (00000000589d67e0): kobject_uevent_env kobject: 'ip6gre0' (00000000589d67e0): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'ip6gre0' (00000000589d67e0): calling ktype release kobject: 'ip6gre0': free name kobject: 'ip6gre0' (0000000008d4a822): kobject_cleanup, parent (null) kobject: 'ip6gre0' (0000000008d4a822): auto cleanup 'remove' event kobject: 'ip6gre0' (0000000008d4a822): kobject_uevent_env kobject: 'ip6gre0' (0000000008d4a822): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'ip6gre0' (0000000008d4a822): calling ktype release kobject: 'ip6gre0': free name kobject: 'loop4' (00000000662bd41c): kobject_uevent_env kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'rx-0' (0000000089c16381): kobject_cleanup, parent 0000000058e00f57 kobject: 'rx-0' (0000000089c16381): auto cleanup 'remove' event FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem kobject: 'loop2' (0000000098216ca2): kobject_uevent_env kobject: 'loop2' (0000000098216ca2): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000662bd41c): kobject_uevent_env Process accounting resumed kobject: 'rx-0' (0000000089c16381): kobject_uevent_env kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000007bea631): kobject_uevent_env kobject: 'rx-0' (0000000089c16381): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'loop0' (0000000007bea631): fill_kobj_path: path = '/devices/virtual/block/loop0' audit: type=1804 audit(2000001154.224:857): pid=7902 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.3" name="/root/syzkaller-testdir171670947/syzkaller.kNK7Ro/2762/file0" dev="sda1" ino=16647 res=1 kobject: 'rx-0' (0000000089c16381): auto cleanup kobject_del kobject: 'rx-0' (0000000089c16381): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (0000000001f07269): kobject_cleanup, parent 0000000058e00f57 kobject: 'tx-0' (0000000001f07269): auto cleanup 'remove' event kobject: 'tx-0' (0000000001f07269): kobject_uevent_env kobject: 'loop4' (00000000662bd41c): kobject_uevent_env kobject: 'tx-0' (0000000001f07269): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (0000000001f07269): auto cleanup kobject_del kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'tx-0' (0000000001f07269): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (0000000058e00f57): kobject_cleanup, parent (null) FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem kobject: 'queues' (0000000058e00f57): calling ktype release kobject: 'queues' (0000000058e00f57): kset_release kobject: 'queues': free name kobject: 'loop4' (00000000662bd41c): kobject_uevent_env kobject: 'loop4' (00000000662bd41c): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'ip6tnl0' (000000006febad69): kobject_uevent_env kobject: 'ip6tnl0' (000000006febad69): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (0000000056403136): kobject_cleanup, parent 00000000faecbd2f kobject: 'rx-0' (0000000056403136): auto cleanup 'remove' event kobject: 'rx-0' (0000000056403136): kobject_uevent_env kobject: 'rx-0' (0000000056403136): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (0000000056403136): auto cleanup kobject_del kobject: 'rx-0' (0000000056403136): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (00000000e6fc3dad): kobject_cleanup, parent 00000000faecbd2f kobject: 'loop2' (0000000098216ca2): kobject_uevent_env kobject: 'loop2' (0000000098216ca2): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'tx-0' (00000000e6fc3dad): auto cleanup 'remove' event kobject: 'tx-0' (00000000e6fc3dad): kobject_uevent_env kobject: 'tx-0' (00000000e6fc3dad): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (00000000e6fc3dad): auto cleanup kobject_del kobject: 'tx-0' (00000000e6fc3dad): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (00000000faecbd2f): kobject_cleanup, parent (null) kobject: 'queues' (00000000faecbd2f): calling ktype release kobject: 'queues' (00000000faecbd2f): kset_release kobject: 'queues': free name kobject: 'ip6tnl0' (000000005e697207): kobject_uevent_env kobject: 'ip6tnl0' (000000005e697207): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (00000000c19a90a5): kobject_cleanup, parent 00000000a44cc8ab kobject: 'rx-0' (00000000c19a90a5): auto cleanup 'remove' event kobject: 'rx-0' (00000000c19a90a5): kobject_uevent_env kobject: 'rx-0' (00000000c19a90a5): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (00000000c19a90a5): auto cleanup kobject_del kobject: 'rx-0' (00000000c19a90a5): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (000000001164904d): kobject_cleanup, parent 00000000a44cc8ab kobject: 'tx-0' (000000001164904d): auto cleanup 'remove' event kobject: 'tx-0' (000000001164904d): kobject_uevent_env kobject: 'tx-0' (000000001164904d): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (000000001164904d): auto cleanup kobject_del kobject: 'tx-0' (000000001164904d): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (00000000a44cc8ab): kobject_cleanup, parent (null) kobject: 'queues' (00000000a44cc8ab): calling ktype release kobject: 'queues' (00000000a44cc8ab): kset_release kobject: 'queues': free name kobject: 'ip6tnl0' (0000000094ea3ad6): kobject_uevent_env kobject: 'ip6tnl0' (0000000094ea3ad6): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'loop2' (0000000098216ca2): kobject_uevent_env kobject: 'ip6tnl0' (000000006febad69): kobject_cleanup, parent (null) kobject: 'loop2' (0000000098216ca2): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'ip6tnl0' (000000006febad69): auto cleanup 'remove' event kobject: 'loop0' (0000000007bea631): kobject_uevent_env kobject: 'ip6tnl0' (000000006febad69): kobject_uevent_env kobject: 'loop0' (0000000007bea631): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'ip6tnl0' (000000006febad69): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'ip6tnl0' (000000006febad69): calling ktype release kobject: 'ip6tnl0': free name kobject: 'ip6tnl0' (000000005e697207): kobject_cleanup, parent (null) kobject: 'ip6tnl0' (000000005e697207): auto cleanup 'remove' event kobject: 'ip6tnl0' (000000005e697207): kobject_uevent_env kobject: 'ip6tnl0' (000000005e697207): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'ip6tnl0' (000000005e697207): calling ktype release kobject: 'loop0' (0000000007bea631): kobject_uevent_env kobject: 'loop0' (0000000007bea631): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'ip6tnl0': free name kobject: 'ip6tnl0' (0000000094ea3ad6): kobject_cleanup, parent (null) kobject: 'ip6tnl0' (0000000094ea3ad6): auto cleanup 'remove' event kobject: 'loop0' (0000000007bea631): kobject_uevent_env kobject: 'loop0' (0000000007bea631): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'ip6tnl0' (0000000094ea3ad6): kobject_uevent_env kobject: 'ip6tnl0' (0000000094ea3ad6): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'loop2' (0000000098216ca2): kobject_uevent_env kobject: 'loop2' (0000000098216ca2): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'ip6tnl0' (0000000094ea3ad6): calling ktype release kobject: 'ip6tnl0': free name kobject: 'rx-0' (0000000020373363): kobject_cleanup, parent 0000000031791dc8 kobject: 'rx-0' (0000000020373363): auto cleanup 'remove' event kobject: 'loop0' (0000000007bea631): kobject_uevent_env kobject: 'loop0' (0000000007bea631): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'rx-0' (0000000020373363): kobject_uevent_env kobject: 'rx-0' (0000000020373363): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (0000000020373363): auto cleanup kobject_del kobject: 'rx-0' (0000000020373363): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (00000000944896d8): kobject_cleanup, parent 0000000031791dc8 kobject: 'loop2' (0000000098216ca2): kobject_uevent_env kobject: 'loop2' (0000000098216ca2): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'tx-0' (00000000944896d8): auto cleanup 'remove' event kobject: 'tx-0' (00000000944896d8): kobject_uevent_env kobject: 'tx-0' (00000000944896d8): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (00000000944896d8): auto cleanup kobject_del kobject: 'tx-0' (00000000944896d8): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (0000000031791dc8): kobject_cleanup, parent (null) kobject: 'queues' (0000000031791dc8): calling ktype release kobject: 'queues' (0000000031791dc8): kset_release