Messages in this thread |  | | Date | Sat, 18 Aug 2018 09:37:02 -0700 | Subject | WARNING: refcount bug in igmp_start_timer | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: edb0a2000936 Merge tag 'arm64-fixes' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1749ebce400000 kernel config: https://syzkaller.appspot.com/x/.config?x=4fd89f99c889a184 dashboard link: https://syzkaller.appspot.com/bug?extid=e28037ac1c96d2a86e89 compiler: gcc (GCC) 8.0.1 20180413 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+e28037ac1c96d2a86e89@syzkaller.appspotmail.com
binder: 17097:17099 Acquire 1 refcount change on invalid ref 0 ret -22 binder: 17097:17099 BC_REQUEST_DEATH_NOTIFICATION invalid ref 0 ------------[ cut here ]------------ refcount_t: increment on 0; use-after-free. WARNING: CPU: 0 PID: 17119 at lib/refcount.c:153 refcount_inc_checked+0x5d/0x70 lib/refcount.c:153 Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 17119 Comm: syz-executor2 Not tainted 4.18.0+ #194 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+0x1c9/0x2b4 lib/dump_stack.c:113 binder: 17097:17122 unknown command 1074553618 panic+0x238/0x4e7 kernel/panic.c:184 __warn.cold.8+0x163/0x1ba kernel/panic.c:536 report_bug+0x252/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993 RIP: 0010:refcount_inc_checked+0x5d/0x70 lib/refcount.c:153 Code: 1d 7d f5 24 05 31 ff 89 de e8 7f be 1b fe 84 db 75 df e8 a6 bd 1b fe 48 c7 c7 00 72 3a 87 c6 05 5d f5 24 05 01 e8 43 4e e6 fd <0f> 0b eb c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 binder: 17097:17122 ioctl c0306201 20000040 returned -22 RSP: 0018:ffff88019521ebd8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000200d000 RDX: 0000000000003667 RSI: ffffffff8163ac21 RDI: ffff88019521e8c8 RBP: ffff88019521ebe0 R08: ffff880199d10080 R09: 0000000000000002 R10: ffff880199d10080 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000008 R14: ffff8801d7aaa2c0 R15: dffffc0000000000 igmp_start_timer+0xaf/0xe0 net/ipv4/igmp.c:217 igmp_mod_timer net/ipv4/igmp.c:255 [inline] igmp_heard_query net/ipv4/igmp.c:1027 [inline] igmp_rcv+0x1920/0x3060 net/ipv4/igmp.c:1062 ip_local_deliver_finish+0x2eb/0xda0 net/ipv4/ip_input.c:215 NF_HOOK include/linux/netfilter.h:287 [inline] ip_local_deliver+0x1e9/0x750 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:415 NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0xed/0x610 net/ipv4/ip_input.c:524 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4892 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5002 netif_receive_skb_internal+0x12e/0x680 net/core/dev.c:5105 netif_receive_skb+0xbf/0x420 net/core/dev.c:5178 tun_rx_batched.isra.56+0x4ba/0x8c0 drivers/net/tun.c:1572 tun_get_user+0x2ac9/0x42c0 drivers/net/tun.c:1982 tun_chr_write_iter+0xb9/0x154 drivers/net/tun.c:2010 call_write_iter include/linux/fs.h:1808 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_writev+0x1f1/0x360 fs/read_write.c:1004 do_writev+0x11a/0x310 fs/read_write.c:1039 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev fs/read_write.c:1109 [inline] __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456f41 Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 b6 fb ff c3 48 83 ec 08 e8 da 2c 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 23 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f1641b03ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000000002a RCX: 0000000000456f41 RDX: 0000000000000001 RSI: 00007f1641b03bf0 RDI: 00000000000000f0 RBP: 0000000020000640 R08: 00000000000000f0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000ffffffff R13: 00000000004d6410 R14: 00000000004c9a96 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..
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