Hello,
syzbot found the following crash on:
HEAD commit: 63bdf4284c38 Merge branch 'linus' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=112c679f200000
kernel config: https://syzkaller.appspot.com/x/.config?x=872be05707464aaa
dashboard link: https://syzkaller.appspot.com/bug?extid=f09d845ad631ed93737b
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1739d54f200000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f09d845ad631ed937...@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
8021q: adding VLAN 0 to HW filter on device batadv0
Started in network mode
Own node identity ac1414aa, cluster identity 4711
New replicast peer: 172.20.20.187
INFO: trying to register non-static key.
Enabled bearer <udp:syz1>, priority 10
the code is fine but needs lockdep annotation.
Enabling of bearer <udp:syz1> rejected, already enabled
turning off the locking correctness validator.
Started in network mode
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.0.0+ #7
Own node identity ac1414aa, cluster identity 4711
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
New replicast peer: 172.20.20.187
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
assign_lock_key kernel/locking/lockdep.c:731 [inline]
register_lock_class+0x1bdc/0x1bf0 kernel/locking/lockdep.c:757
__lock_acquire+0x11f/0x4700 kernel/locking/lockdep.c:3224
Enabled bearer <udp:syz1>, priority 10
Enabling of bearer <udp:syz1> rejected, already enabled
Enabling of bearer <udp:syz1> rejected, already enabled
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841
Enabling of bearer <udp:syz1> rejected, already enabled
__raw_spin_trylock include/linux/spinlock_api_smp.h:90 [inline]
_raw_spin_trylock+0x62/0x80 kernel/locking/spinlock.c:128
spin_trylock include/linux/spinlock.h:339 [inline]
icmp_xmit_lock net/ipv4/icmp.c:219 [inline]
__icmp_send+0x553/0x1400 net/ipv4/icmp.c:666
Enabling of bearer <udp:syz1> rejected, already enabled
Enabling of bearer <udp:syz1> rejected, already enabled
kobject: 'loop3' (00000000853c4d7c): kobject_uevent_env
kobject: 'loop3' (00000000853c4d7c): fill_kobj_path: path
= '/devices/virtual/block/loop3'
icmp_send include/net/icmp.h:47 [inline]
__udp4_lib_rcv+0x1fb6/0x2c50 net/ipv4/udp.c:2323
Enabling of bearer <udp:syz1> rejected, already enabled
udp_rcv+0x22/0x30 net/ipv4/udp.c:2482
Enabling of bearer <udp:syz1> rejected, already enabled
ip_protocol_deliver_rcu+0x60/0x8f0 net/ipv4/ip_input.c:208
kobject: 'loop3' (00000000853c4d7c): kobject_uevent_env
kobject: 'loop3' (00000000853c4d7c): fill_kobj_path: path
= '/devices/virtual/block/loop3'
ip_local_deliver_finish+0x23b/0x390 net/ipv4/ip_input.c:234
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
ip_local_deliver+0x1e9/0x520 net/ipv4/ip_input.c:255
dst_input include/net/dst.h:450 [inline]
ip_rcv_finish+0x1e1/0x300 net/ipv4/ip_input.c:414
Enabling of bearer <udp:syz1> rejected, already enabled
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
ip_rcv+0xe8/0x3f0 net/ipv4/ip_input.c:524
Enabling of bearer <udp:syz1> rejected, already enabled
__netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973
__netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
process_backlog+0x206/0x750 net/core/dev.c:5923
napi_poll net/core/dev.c:6346 [inline]
net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
__do_softirq+0x266/0x95a kernel/softirq.c:292
kobject: 'loop3' (00000000853c4d7c): kobject_uevent_env
run_ksoftirqd kernel/softirq.c:654 [inline]
run_ksoftirqd+0x8e/0x110 kernel/softirq.c:646
smpboot_thread_fn+0x6ab/0xa10 kernel/smpboot.c:164
Enabling of bearer <udp:syz1> rejected, already enabled
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
kasan: CONFIG_KASAN_INLINE enabled
kobject: 'loop3' (00000000853c4d7c): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.0.0+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__ip_append_data.isra.0+0x2e6/0x2dd0 net/ipv4/ip_output.c:898
Code: c7 85 cc fe ff ff 00 00 00 00 0f 85 28 13 00 00 e8 1f a6 99 fb 48 8b
95 38 ff ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f
85 73 28 00 00 48 8b 85 38 ff ff ff 48 8b 18 48 b8
RSP: 0018:ffff8880aa2c72a0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85d63de1
RDX: 0000000000000000 RSI: ffffffff85d63e61 RDI: 0000000000000001
RBP: ffff8880aa2c7410 R08: ffff8880aa2b2440 R09: ffffffff85e694d0
R10: ffff8880aa2c7580 R11: ffff88808e459b43 R12: ffff88808e774a70
R13: ffff88808e774f10 R14: 0000000000000000 R15: dead4ead00000000
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f759ac634c0 CR3: 0000000093e6c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ip_append_data.part.0+0xf2/0x170 net/ipv4/ip_output.c:1220
ip_append_data+0x6e/0x90 net/ipv4/ip_output.c:1209
icmp_push_reply+0x189/0x510 net/ipv4/icmp.c:375
kobject: 'loop4' (000000008703cf7f): kobject_uevent_env
__icmp_send+0xaa1/0x1400 net/ipv4/icmp.c:737
kobject: 'loop4' (000000008703cf7f): fill_kobj_path: path
= '/devices/virtual/block/loop4'
kobject: 'loop5' (00000000e99d8403): kobject_uevent_env
kobject: 'loop5' (00000000e99d8403): fill_kobj_path: path
= '/devices/virtual/block/loop5'
kobject: 'loop2' (00000000f5e9c027): kobject_uevent_env
icmp_send include/net/icmp.h:47 [inline]
__udp4_lib_rcv+0x1fb6/0x2c50 net/ipv4/udp.c:2323
kobject: 'loop2' (00000000f5e9c027): fill_kobj_path: path
= '/devices/virtual/block/loop2'
udp_rcv+0x22/0x30 net/ipv4/udp.c:2482
ip_protocol_deliver_rcu+0x60/0x8f0 net/ipv4/ip_input.c:208
ip_local_deliver_finish+0x23b/0x390 net/ipv4/ip_input.c:234
kobject: 'loop3' (00000000853c4d7c): kobject_uevent_env
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
ip_local_deliver+0x1e9/0x520 net/ipv4/ip_input.c:255
kobject: 'loop3' (00000000853c4d7c): fill_kobj_path: path
= '/devices/virtual/block/loop3'
dst_input include/net/dst.h:450 [inline]
ip_rcv_finish+0x1e1/0x300 net/ipv4/ip_input.c:414
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
ip_rcv+0xe8/0x3f0 net/ipv4/ip_input.c:524
__netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973
__netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
process_backlog+0x206/0x750 net/core/dev.c:5923
napi_poll net/core/dev.c:6346 [inline]
net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
__do_softirq+0x266/0x95a kernel/softirq.c:292
run_ksoftirqd kernel/softirq.c:654 [inline]
run_ksoftirqd+0x8e/0x110 kernel/softirq.c:646
smpboot_thread_fn+0x6ab/0xa10 kernel/smpboot.c:164
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 8731dbaebb58f7f1 ]---
RIP: 0010:__ip_append_data.isra.0+0x2e6/0x2dd0 net/ipv4/ip_output.c:898
Code: c7 85 cc fe ff ff 00 00 00 00 0f 85 28 13 00 00 e8 1f a6 99 fb 48 8b
95 38 ff ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f
85 73 28 00 00 48 8b 85 38 ff ff ff 48 8b 18 48 b8
RSP: 0018:ffff8880aa2c72a0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff85d63de1
RDX: 0000000000000000 RSI: ffffffff85d63e61 RDI: 0000000000000001
RBP: ffff8880aa2c7410 R08: ffff8880aa2b2440 R09: ffffffff85e694d0
R10: ffff8880aa2c7580 R11: ffff88808e459b43 R12: ffff88808e774a70
R13: ffff88808e774f10 R14: 0000000000000000 R15: dead4ead00000000
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f759ac634c0 CR3: 0000000093e6c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
32-bit node address hash set to aa1414ac
---
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