======================================================
WARNING: possible circular locking dependency detected
4.14.256-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.1/11960 is trying to acquire lock:
 (&oi->lock){+.+.}, at: [<ffffffff8230fd50>] ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318

but task is already holding lock:
 (sb_writers#6){.+.+}, at: [<ffffffff818de18a>] sb_start_write include/linux/fs.h:1549 [inline]
 (sb_writers#6){.+.+}, at: [<ffffffff818de18a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (sb_writers#6){.+.+}:
       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+0x64/0x260 fs/super.c:1342
       sb_start_write include/linux/fs.h:1549 [inline]
       mnt_want_write+0x3a/0xb0 fs/namespace.c:386
       ovl_rename+0x11b/0xe50 fs/overlayfs/dir.c:935
       vfs_rename+0x560/0x1820 fs/namei.c:4496
       SYSC_renameat2 fs/namei.c:4644 [inline]
       SyS_renameat2+0x95b/0xad0 fs/namei.c:4533
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #1 (&ovl_i_mutex_dir_key[depth]#3){++++}:
       down_read+0x36/0x80 kernel/locking/rwsem.c:24
       inode_lock_shared include/linux/fs.h:729 [inline]
       lookup_slow+0x129/0x400 fs/namei.c:1674
       lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595
       ovl_lower_positive+0x184/0x350 fs/overlayfs/namei.c:783
       ovl_rename+0x47c/0xe50 fs/overlayfs/dir.c:968
       vfs_rename+0x560/0x1820 fs/namei.c:4496
       SYSC_renameat2 fs/namei.c:4644 [inline]
       SyS_renameat2+0x95b/0xad0 fs/namei.c:4533
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x46/0xbb

-> #0 (&oi->lock){+.+.}:
       lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
       ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318
       ovl_copy_up_one+0x21f/0x910 fs/overlayfs/copy_up.c:631
       ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:686
       ovl_rename+0x164/0xe50 fs/overlayfs/dir.c:939
       vfs_rename+0x560/0x1820 fs/namei.c:4496
       SYSC_renameat2 fs/namei.c:4644 [inline]
       SyS_renameat2+0x95b/0xad0 fs/namei.c:4533
       do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
       entry_SYSCALL_64_after_hwframe+0x46/0xbb

other info that might help us debug this:

Chain exists of:
  &oi->lock --> &ovl_i_mutex_dir_key[depth]#3 --> sb_writers#6

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sb_writers#6);
                               lock(&ovl_i_mutex_dir_key[depth]#3);
                               lock(sb_writers#6);
  lock(&oi->lock);

 *** DEADLOCK ***

6 locks held by syz-executor.1/11960:
 #0:  (sb_writers#14){.+.+}, at: [<ffffffff818de18a>] sb_start_write include/linux/fs.h:1549 [inline]
 #0:  (sb_writers#14){.+.+}, at: [<ffffffff818de18a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386
 #1:  (&type->s_vfs_rename_key#3){+.+.}, at: [<ffffffff8188f7c4>] lock_rename+0x54/0x280 fs/namei.c:2889
 #2:  (&ovl_i_mutex_dir_key[depth]/1){+.+.}, at: [<ffffffff8188f8a2>] inode_lock_nested include/linux/fs.h:754 [inline]
 #2:  (&ovl_i_mutex_dir_key[depth]/1){+.+.}, at: [<ffffffff8188f8a2>] lock_rename+0x132/0x280 fs/namei.c:2900
 #3:  (&ovl_i_mutex_dir_key[depth]#3/2){+.+.}, at: [<ffffffff8188f8d6>] inode_lock_nested include/linux/fs.h:754 [inline]
 #3:  (&ovl_i_mutex_dir_key[depth]#3/2){+.+.}, at: [<ffffffff8188f8d6>] lock_rename+0x166/0x280 fs/namei.c:2901
 #4:  (&ovl_i_mutex_dir_key[depth]#3){++++}, at: [<ffffffff818a3398>] inode_lock include/linux/fs.h:719 [inline]
 #4:  (&ovl_i_mutex_dir_key[depth]#3){++++}, at: [<ffffffff818a3398>] vfs_rename+0xbd8/0x1820 fs/namei.c:4470
 #5:  (sb_writers#6){.+.+}, at: [<ffffffff818de18a>] sb_start_write include/linux/fs.h:1549 [inline]
 #5:  (sb_writers#6){.+.+}, at: [<ffffffff818de18a>] mnt_want_write+0x3a/0xb0 fs/namespace.c:386

stack backtrace:
CPU: 1 PID: 11960 Comm: syz-executor.1 Not tainted 4.14.256-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
 check_prev_add kernel/locking/lockdep.c:1905 [inline]
 check_prevs_add kernel/locking/lockdep.c:2022 [inline]
 validate_chain kernel/locking/lockdep.c:2464 [inline]
 __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __mutex_lock_common kernel/locking/mutex.c:756 [inline]
 __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
 ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318
 ovl_copy_up_one+0x21f/0x910 fs/overlayfs/copy_up.c:631
 ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:686
 ovl_rename+0x164/0xe50 fs/overlayfs/dir.c:939
 vfs_rename+0x560/0x1820 fs/namei.c:4496
 SYSC_renameat2 fs/namei.c:4644 [inline]
 SyS_renameat2+0x95b/0xad0 fs/namei.c:4533
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f48f0245ae9
RSP: 002b:00007f48ef1bb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f48f0358f60 RCX: 00007f48f0245ae9
RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000020000100
RBP: 00007f48f029fff7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffeb753055f R14: 00007f48ef1bb300 R15: 0000000000022000
orangefs_mount: mount request failed with -4
ip6_tables: ip6tables: counters copy to user failed while replacing table
ip6_tables: ip6tables: counters copy to user failed while replacing table
EXT4-fs (loop3): Unrecognized mount option "cgroup.kill" or missing value
EXT4-fs (loop5): bad geometry: block count 128 exceeds size of device (1 blocks)
EXT4-fs (loop5): bad geometry: block count 128 exceeds size of device (1 blocks)
EXT4-fs (loop2): first meta block group too large: 12 (group descriptor block count 1)
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
syz-executor.2 (12308): drop_caches: 2
bridge0: port 3(ip6gretap0) entered blocking state
bridge0: port 3(ip6gretap0) entered disabled state
device ip6gretap0 entered promiscuous mode
bridge0: port 3(ip6gretap0) entered blocking state
bridge0: port 3(ip6gretap0) entered forwarding state
NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024)
device ip6gretap0 left promiscuous mode
bridge0: port 3(ip6gretap0) entered disabled state
NILFS (loop2): mounting unchecked fs
bridge0: port 3(ip6gretap0) entered blocking state
NILFS (loop2): recovery complete
bridge0: port 3(ip6gretap0) entered disabled state
NILFS (loop2): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
device ip6gretap0 entered promiscuous mode
bridge0: port 3(ip6gretap0) entered blocking state
bridge0: port 3(ip6gretap0) entered forwarding state
BTRFS: device fsid f90cac8b-044b-4fa8-8bee-4b8d3da88dc2 devid 1 transid 7 /dev/loop1
BTRFS error (device loop1): superblock checksum mismatch
BTRFS error (device loop1): open_ctree failed
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 12516 Comm: syz-executor.5 Not tainted 4.14.256-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc_node mm/slab.c:3297 [inline]
 kmem_cache_alloc_node+0x263/0x410 mm/slab.c:3640
 __alloc_skb+0x5c/0x510 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1166 [inline]
 netlink_sendmsg+0x90b/0xb90 net/netlink/af_netlink.c:1861
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
can: request_module (can-proto-0) failed.
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f1125e0eae9
RSP: 002b:00007f1124d84188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1125f21f60 RCX: 00007f1125e0eae9
RDX: 0000000000000000 RSI: 00000000200029c0 RDI: 0000000000000003
RBP: 00007f1124d841d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffac6a6f6f R14: 00007f1124d84300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 12542 Comm: syz-executor.5 Not tainted 4.14.256-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc_node mm/slab.c:3297 [inline]
 kmem_cache_alloc_node_trace+0x25a/0x400 mm/slab.c:3659
 __do_kmalloc_node mm/slab.c:3681 [inline]
 __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3696
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0x96/0x510 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:980 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1166 [inline]
 netlink_sendmsg+0x90b/0xb90 net/netlink/af_netlink.c:1861
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f1125e0eae9
RSP: 002b:00007f1124d84188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1125f21f60 RCX: 00007f1125e0eae9
RDX: 0000000000000000 RSI: 00000000200029c0 RDI: 0000000000000003
RBP: 00007f1124d841d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffac6a6f6f R14: 00007f1124d84300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 12571 Comm: syz-executor.0 Not tainted 4.14.256-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc_node mm/slab.c:3297 [inline]
 kmem_cache_alloc_node+0x263/0x410 mm/slab.c:3640
 __alloc_skb+0x5c/0x510 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1166 [inline]
 netlink_sendmsg+0x90b/0xb90 net/netlink/af_netlink.c:1861
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
device team1 entered promiscuous mode
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7fca30a07ae9
RSP: 002b:00007fca2f97d188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fca30b1af60 RCX: 00007fca30a07ae9
RDX: 0000000000000000 RSI: 00000000200029c0 RDI: 0000000000000003
RBP: 00007fca2f97d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe7696f8ef R14: 00007fca2f97d300 R15: 0000000000022000
can: request_module (can-proto-0) failed.
CPU: 1 PID: 12579 Comm: syz-executor.5 Not tainted 4.14.256-syzkaller #0
overlayfs: unrecognized mount option "upperdiÉÂmŒ.åè¤ácø^G=0ä6Ìù¡âr=./bus$wor~d" or missing value
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3376 [inline]
 kmem_cache_alloc+0x40/0x3c0 mm/slab.c:3550
 skb_clone+0x126/0x9a0 net/core/skbuff.c:1291
 __netlink_deliver_tap_skb net/netlink/af_netlink.c:266 [inline]
 __netlink_deliver_tap net/netlink/af_netlink.c:291 [inline]
 netlink_deliver_tap+0x655/0x7d0 net/netlink/af_netlink.c:302
 netlink_deliver_tap_kernel net/netlink/af_netlink.c:311 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1293 [inline]
 netlink_unicast+0x485/0x610 net/netlink/af_netlink.c:1320
 netlink_sendmsg+0x638/0xb90 net/netlink/af_netlink.c:1886
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f1125e0eae9
RSP: 002b:00007f1124d84188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1125f21f60 RCX: 00007f1125e0eae9
RDX: 0000000000000000 RSI: 00000000200029c0 RDI: 0000000000000003
RBP: 00007f1124d841d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffac6a6f6f R14: 00007f1124d84300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 12597 Comm: syz-executor.0 Not tainted 4.14.256-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc_node mm/slab.c:3297 [inline]
 kmem_cache_alloc_node_trace+0x25a/0x400 mm/slab.c:3659
 __do_kmalloc_node mm/slab.c:3681 [inline]
 __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3696
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0x96/0x510 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:980 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1166 [inline]
 netlink_sendmsg+0x90b/0xb90 net/netlink/af_netlink.c:1861
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7fca30a07ae9
RSP: 002b:00007fca2f97d188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fca30b1af60 RCX: 00007fca30a07ae9
RDX: 0000000000000000 RSI: 00000000200029c0 RDI: 0000000000000003
RBP: 00007fca2f97d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe7696f8ef R14: 00007fca2f97d300 R15: 0000000000022000
CPU: 0 PID: 12601 Comm: syz-executor.5 Not tainted 4.14.256-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc_node mm/slab.c:3297 [inline]
 kmem_cache_alloc_node+0x263/0x410 mm/slab.c:3640
 __alloc_skb+0x5c/0x510 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 netlink_dump+0x21b/0xad0 net/netlink/af_netlink.c:2192
 __netlink_dump_start+0x4e2/0x740 net/netlink/af_netlink.c:2308
 genl_family_rcv_msg+0x817/0xb20 net/netlink/genetlink.c:560
 genl_rcv_msg+0xaf/0x140 net/netlink/genetlink.c:625
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2441
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:636
 netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320
 netlink_sendmsg+0x638/0xb90 net/netlink/af_netlink.c:1886
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f1125e0eae9
RSP: 002b:00007f1124d84188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1125f21f60 RCX: 00007f1125e0eae9
RDX: 0000000000000000 RSI: 00000000200029c0 RDI: 0000000000000003
RBP: 00007f1124d841d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffac6a6f6f R14: 00007f1124d84300 R15: 0000000000022000
NILFS (loop2): couldn't find nilfs on the device
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 12668 Comm: syz-executor.0 Not tainted 4.14.256-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3376 [inline]
 kmem_cache_alloc+0x40/0x3c0 mm/slab.c:3550
 skb_clone+0x126/0x9a0 net/core/skbuff.c:1291
 __netlink_deliver_tap_skb net/netlink/af_netlink.c:266 [inline]
 __netlink_deliver_tap net/netlink/af_netlink.c:291 [inline]
 netlink_deliver_tap+0x655/0x7d0 net/netlink/af_netlink.c:302
 netlink_deliver_tap_kernel net/netlink/af_netlink.c:311 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1293 [inline]
 netlink_unicast+0x485/0x610 net/netlink/af_netlink.c:1320
 netlink_sendmsg+0x638/0xb90 net/netlink/af_netlink.c:1886
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7fca30a07ae9
RSP: 002b:00007fca2f97d188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fca30b1af60 RCX: 00007fca30a07ae9
RDX: 0000000000000000 RSI: 00000000200029c0 RDI: 0000000000000003
RBP: 00007fca2f97d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe7696f8ef R14: 00007fca2f97d300 R15: 0000000000022000