syzbot


general protection fault in relay_switch_subbuf

Status: auto-closed as invalid on 2019/07/23 22:29
Reported-by: syzbot+8e789999f280ccd6930f@syzkaller.appspotmail.com
First crash: 1588d, last: 1468d
similar bugs (7):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 general protection fault in relay_switch_subbuf 2 1041d 1134d 0/1 auto-closed as invalid on 2020/07/25 03:12
upstream KASAN: use-after-free Read in relay_switch_subbuf C done error 93 94d 1588d 0/24 upstream: reported C repro on 2018/09/26 07:41
upstream general protection fault in relay_switch_subbuf (2) 1 1281d 1272d 0/24 auto-closed as invalid on 2019/10/25 14:11
upstream general protection fault in relay_switch_subbuf (3) 1 1188d 1188d 0/24 auto-closed as invalid on 2020/01/29 10:20
linux-4.19 general protection fault in relay_switch_subbuf 1 1263d 1263d 0/1 auto-closed as invalid on 2019/12/15 08:14
linux-4.19 general protection fault in relay_switch_subbuf (2) 1 960d 960d 0/1 auto-closed as invalid on 2020/10/13 07:52
linux-4.19 KASAN: use-after-free Read in relay_switch_subbuf (2) 22 3d20h 471d 0/1 upstream: reported on 2021/10/17 18:33

Sample crash report:
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 11600 Comm: syz-executor2 Not tainted 5.0.0-rc3+ #42
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:relay_switch_subbuf+0x27a/0xad0 kernel/relay.c:753
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e2 07 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 4b 58 48 8d 79 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c9 07 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffff88805e3ef790 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88804bc7db40 RCX: 0000000000000000
RDX: 000000000000000a RSI: ffffffff8182d552 RDI: 0000000000000050
RBP: ffff88805e3ef850 R08: ffff8880637f0600 R09: fffffbfff133b0b1
R10: ffff88805e3ef850 R11: ffffffff899d8587 R12: 0000000000000000
R13: ffff8880a7e05e00 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f1fdbddd700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000a50489 CR3: 00000000943a0000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 relay_flush kernel/relay.c:881 [inline]
 relay_flush+0x1c4/0x280 kernel/relay.c:865
 __blk_trace_startstop.isra.0+0x28b/0x8b0 kernel/trace/blktrace.c:668
 blk_trace_ioctl+0x1c6/0x300 kernel/trace/blktrace.c:727
 blkdev_ioctl+0x141/0x2120 block/ioctl.c:591
 block_ioctl+0xee/0x130 fs/block_dev.c:1914
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458099
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f1fdbddcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099
RDX: 0000000000000000 RSI: 0000000000001275 RDI: 0000000000000005
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1fdbddd6d4
R13: 00000000004bf595 R14: 00000000004d0e88 R15: 00000000ffffffff
Modules linked in:
kobject: 'loop4' (000000005903bd4d): kobject_uevent_env
kobject: 'loop4' (000000005903bd4d): fill_kobj_path: path = '/devices/virtual/block/loop4'
---[ end trace d4380d594e5099d1 ]---
RIP: 0010:relay_switch_subbuf+0x27a/0xad0 kernel/relay.c:753
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e2 07 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 4b 58 48 8d 79 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 c9 07 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b
kobject: 'loop0' (0000000083b22ec7): kobject_uevent_env
kobject: 'loop0' (0000000083b22ec7): fill_kobj_path: path = '/devices/virtual/block/loop0'
Unknown ioctl 19304
kobject: 'loop3' (0000000050016e38): kobject_uevent_env
RSP: 0018:ffff88805e3ef790 EFLAGS: 00010206
kobject: 'loop3' (0000000050016e38): fill_kobj_path: path = '/devices/virtual/block/loop3'
RAX: dffffc0000000000 RBX: ffff88804bc7db40 RCX: 0000000000000000
kobject: 'loop1' (000000002962ffee): kobject_uevent_env
kobject: 'loop1' (000000002962ffee): fill_kobj_path: path = '/devices/virtual/block/loop1'
RDX: 000000000000000a RSI: ffffffff8182d552 RDI: 0000000000000050
kobject: 'loop4' (000000005903bd4d): kobject_uevent_env
kobject: 'loop4' (000000005903bd4d): fill_kobj_path: path = '/devices/virtual/block/loop4'
RBP: ffff88805e3ef850 R08: ffff8880637f0600 R09: fffffbfff133b0b1
kobject: 'loop4' (000000005903bd4d): kobject_uevent_env
R10: ffff88805e3ef850 R11: ffffffff899d8587 R12: 0000000000000000
kobject: 'loop4' (000000005903bd4d): fill_kobj_path: path = '/devices/virtual/block/loop4'
R13: ffff8880a7e05e00 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f1fdbddd700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 00000000943a0000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce-smack-root 2019/01/24 22:28 upstream c04e2a780caf bfab9cd8 .config console log report
ci-upstream-kasan-gce-selinux-root 2018/12/20 03:39 upstream ab63e725b49c 02e69052 .config console log report
ci-upstream-kasan-gce-root 2018/11/26 10:48 upstream 2e6e902d1850 ac912200 .config console log report
ci-upstream-linux-next-kasan-gce-root 2018/09/26 19:05 linux-next 9aa0219c6a4c 455b6354 .config console log report
* Struck through repros no longer work on HEAD.