bisecting fixing commit since ddef1e8e3f6eb26034833b7255e3fa584d54a230
building syzkaller on a41ca8fa8285754d8561dcc3ed54cca2da60eed7
testing commit ddef1e8e3f6eb26034833b7255e3fa584d54a230 with gcc (GCC) 8.1.0
kernel signature: 669c1986d0b1b90e3c4a92658ea08689d5e08cb38febd204a9f754f498e38538
run #0: crashed: BUG: corrupted list in p9_fd_request
run #1: crashed: BUG: corrupted list in p9_fd_request
run #2: crashed: BUG: corrupted list in p9_fd_request
run #3: crashed: BUG: corrupted list in p9_fd_request
run #4: crashed: BUG: corrupted list in p9_fd_request
run #5: crashed: BUG: corrupted list in p9_fd_request
run #6: crashed: BUG: corrupted list in corrupted
run #7: crashed: BUG: corrupted list in p9_fd_request
run #8: crashed: BUG: corrupted list in p9_fd_request
run #9: crashed: BUG: corrupted list in p9_conn_cancel
testing current HEAD d71f695ce745df9544a85d8a762f16d72e72df00
testing commit d71f695ce745df9544a85d8a762f16d72e72df00 with gcc (GCC) 8.1.0
kernel signature: f1b7d15bfedb82823f2c07cf9a5f2e98315f9143219023cbba29134c445415c9
run #0: crashed: BUG: corrupted list in corrupted
run #1: crashed: BUG: corrupted list in p9_fd_request
run #2: crashed: BUG: corrupted list in p9_fd_request
run #3: crashed: BUG: corrupted list in p9_fd_request
run #4: crashed: BUG: corrupted list in p9_fd_request
run #5: crashed: BUG: corrupted list in p9_fd_request
run #6: crashed: BUG: corrupted list in p9_fd_request
run #7: crashed: BUG: corrupted list in p9_fd_request
run #8: crashed: BUG: corrupted list in p9_fd_request
run #9: crashed: BUG: corrupted list in p9_fd_request
revisions tested: 2, total time: 26m4.976354159s (build: 17m28.370897561s, test: 7m28.561344722s)
the crash still happens on HEAD
commit msg: Linux 4.14.179
crash: BUG: corrupted list in p9_fd_request
list_add double add: new=ffff888078b00298, prev=ffff888078b00298, next=ffff8880a4ceccc0.
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:31!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 17602 Comm: syz-executor.2 Not tainted 4.14.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888097ddc600 task.stack: ffff888098628000
RIP: 0010:__list_add_valid+0xaa/0xb0 lib/list_debug.c:29
RSP: 0018:ffff88809862f9b0 EFLAGS: 00010282
RAX: 0000000000000058 RBX: ffff8880a4ceccc0 RCX: 0000000000000000
RDX: 0000000000000058 RSI: ffffffff868cf1a0 RDI: ffffed10130c5f2d
RBP: ffff88809862f9c8 R08: ffff888097ddced0 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000000 R12: ffff888078b00298
R13: ffff888078b00270 R14: ffff888078b00298 R15: ffff888078b00298
FS:  00007f3bcd0bf700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fed12cf9db8 CR3: 0000000091b1d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_add include/linux/list.h:60 [inline]
 list_add_tail include/linux/list.h:93 [inline]
 p9_fd_request+0xdd/0x2b0 net/9p/trans_fd.c:679
 p9_client_rpc+0x1fd/0xe80 net/9p/client.c:774
 p9_client_clunk+0x7b/0x120 net/9p/client.c:1507
 v9fs_dentry_release+0x5e/0xc0 fs/9p/vfs_dentry.c:73
 __dentry_kill+0x330/0x540 fs/dcache.c:596
 dentry_kill fs/dcache.c:632 [inline]
 dput.part.27+0x49a/0x610 fs/dcache.c:847
 dput fs/dcache.c:811 [inline]
 do_one_tree+0x36/0x40 fs/dcache.c:1507
 shrink_dcache_for_umount+0x56/0x110 fs/dcache.c:1521
 generic_shutdown_super+0x61/0x330 fs/super.c:431
 kill_anon_super+0x37/0x50 fs/super.c:1006
 v9fs_kill_super+0x39/0x90 fs/9p/vfs_super.c:230
 deactivate_locked_super+0x62/0xb0 fs/super.c:319
 deactivate_super+0x7d/0x90 fs/super.c:350
 cleanup_mnt+0x9f/0x130 fs/namespace.c:1183
 __cleanup_mnt+0xd/0x10 fs/namespace.c:1190
 task_work_run+0xe5/0x170 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x16a/0x1b0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459f49
RSP: 002b:00007f3bcd0bec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000459f49
RDX: 0000000000000000 RSI: 000000000000000b RDI: 0000000020000140
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3bcd0bf6d4
R13: 00000000004c9c3a R14: 00000000004e1860 R15: 00000000ffffffff
Code: 75 e8 eb a9 48 89 f7 48 89 75 e8 e8 21 a7 af fe 48 8b 75 e8 eb bb 48 89 f2 48 89 d9 4c 89 e6 48 c7 c7 20 e4 bc 86 e8 f3 fc 75 fe <0f> 0b 0f 1f 40 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 
RIP: __list_add_valid+0xaa/0xb0 lib/list_debug.c:29 RSP: ffff88809862f9b0
---[ end trace e1940f9af38de80b ]---