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Message-ID: <000000000000ac48ed05866bbc2c@google.com> Date: Sat, 13 Apr 2019 09:16:08 -0700 From: syzbot <syzbot+bd8cc73d665590a1fcad@...kaller.appspotmail.com> To: davem@...emloft.net, kgraul@...ux.ibm.com, linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com, ubraun@...ux.ibm.com Subject: WARNING in smc_unhash_sk (2) Hello, syzbot found the following crash on: HEAD commit: e0a092eb Merge branch 'smc-next' git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=10fb322d200000 kernel config: https://syzkaller.appspot.com/x/.config?x=94c460c3e4cd188a dashboard link: https://syzkaller.appspot.com/bug?extid=bd8cc73d665590a1fcad compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=176c98f3200000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15ea286b200000 The bug was bisected to: commit 50717a37db032ce783f50685a73bb2ac68471a5a Author: Ursula Braun <ubraun@...ux.ibm.com> Date: Fri Apr 12 10:57:23 2019 +0000 net/smc: nonblocking connect rework bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14764e5b200000 final crash: https://syzkaller.appspot.com/x/report.txt?x=16764e5b200000 console output: https://syzkaller.appspot.com/x/log.txt?x=12764e5b200000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+bd8cc73d665590a1fcad@...kaller.appspotmail.com Fixes: 50717a37db03 ("net/smc: nonblocking connect rework") WARNING: CPU: 0 PID: 7716 at include/net/sock.h:666 sk_del_node_init include/net/sock.h:666 [inline] WARNING: CPU: 0 PID: 7716 at include/net/sock.h:666 smc_unhash_sk+0x1ea/0x260 net/smc/af_smc.c:95 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7716 Comm: syz-executor514 Not tainted 5.1.0-rc4+ #135 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 panic+0x2cb/0x65c kernel/panic.c:214 __warn.cold+0x20/0x45 kernel/panic.c:571 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:sk_del_node_init include/net/sock.h:666 [inline] RIP: 0010:smc_unhash_sk+0x1ea/0x260 net/smc/af_smc.c:95 Code: ff ff ff ff e8 57 e6 95 fe e8 82 9e 92 fa 4c 89 ef e8 ca 21 38 00 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 66 9e 92 fa <0f> 0b eb 86 4c 89 e7 e8 9a e7 ca fa e9 5f ff ff ff e8 b0 e7 ca fa RSP: 0018:ffff888085e3fbd8 EFLAGS: 00010293 RAX: ffff888090874080 RBX: ffff8880914f9240 RCX: ffffffff86ddf01e RDX: 0000000000000000 RSI: ffffffff86ddf09a RDI: 0000000000000005 RBP: ffff888085e3fc08 R08: ffff888090874080 R09: ffffed101229f259 R10: ffffed101229f258 R11: ffff8880914f92c3 R12: ffff8880914f92c0 R13: ffffffff895353e0 R14: ffff8880914f9268 R15: 0000000000000001 smc_release+0x337/0x820 net/smc/af_smc.c:164 __sock_release+0xd3/0x2b0 net/socket.c:599 sock_close+0x1b/0x30 net/socket.c:1247 __fput+0x2e5/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x90a/0x2fa0 kernel/exit.c:876 do_group_exit+0x135/0x370 kernel/exit.c:980 __do_sys_exit_group kernel/exit.c:991 [inline] __se_sys_exit_group kernel/exit.c:989 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:989 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x43ee18 Code: Bad RIP value. RSP: 002b:00007ffc9ebae588 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee18 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00000000004be628 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
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