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Date: Fri, 23 Feb 2018 07:59:01 -0800 From: syzbot <syzbot+3a0748c8f2f210c0ef9b@...kaller.appspotmail.com> To: davem@...emloft.net, linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com, ubraun@...ux.vnet.ibm.com Subject: WARNING in smc_unhash_sk Hello, syzbot hit the following crash on upstream commit af3e79d29555b97dd096e2f8e36a0f50213808a8 (Tue Feb 20 18:05:02 2018 +0000) Merge tag 'leds_for-4.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds So far this crash happened 27 times on https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/master, net-next, upstream. C reproducer is attached. syzkaller reproducer is attached. Raw console output is attached. compiler: gcc (GCC) 7.1.1 20170620 .config is attached. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+3a0748c8f2f210c0ef9b@...kaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. WARNING: CPU: 1 PID: 9921 at ./include/net/sock.h:638 sk_del_node_init include/net/sock.h:638 [inline] WARNING: CPU: 1 PID: 9921 at ./include/net/sock.h:638 smc_unhash_sk+0x335/0x450 net/smc/af_smc.c:90 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 9921 Comm: syzkaller089677 Not tainted 4.16.0-rc2+ #324 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+0x194/0x24d lib/dump_stack.c:53 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1dc/0x200 kernel/panic.c:547 report_bug+0x211/0x2d0 lib/bug.c:184 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178 fixup_bug arch/x86/kernel/traps.c:247 [inline] do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957 RIP: 0010:sk_del_node_init include/net/sock.h:638 [inline] RIP: 0010:smc_unhash_sk+0x335/0x450 net/smc/af_smc.c:90 RSP: 0018:ffff8801b639f198 EFLAGS: 00010293 RAX: ffff8801b684a340 RBX: 1ffff10036c73e37 RCX: ffffffff85a3f1f5 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 1ffff10036c73e3b RBP: ffff8801b639f280 R08: dffffc0000000000 R09: 0000000000000004 R10: ffff8801b639f050 R11: 0000000000000004 R12: ffff8801b639f258 R13: ffffffff87669b40 R14: ffff8801c08d57c0 R15: 1ffff10036c73e3b smc_release+0x321/0x580 net/smc/af_smc.c:148 sock_release+0x8d/0x1e0 net/socket.c:595 sock_close+0x16/0x20 net/socket.c:1149 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73a/0x16d0 kernel/signal.c:2469 do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_64+0x6e5/0x940 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x44cad9 RSP: 002b:00007fbf24687ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000007 RAX: 0000000000000001 RBX: 0000000000700024 RCX: 000000000044cad9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020000080 RBP: 0000000000700020 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000080ef3f R14: 00007fbf246889c0 R15: 0000000000000005 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@...glegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body. View attachment "raw.log.txt" of type "text/plain" (42650 bytes) View attachment "repro.syz.txt" of type "text/plain" (595 bytes) View attachment "repro.c.txt" of type "text/plain" (31962 bytes) View attachment "config.txt" of type "text/plain" (137429 bytes)
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