syzbot


general protection fault in find_entry (3)

Status: auto-closed as invalid on 2021/07/01 18:40
Reported-by: syzbot+acefa31193cebfd80957@syzkaller.appspotmail.com
First crash: 515d, last: 515d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in find_entry (2) 1 1376d 1376d 0/24 auto-closed as invalid on 2019/06/21 12:54
upstream general protection fault in find_entry 1 1746d 1742d 0/24 closed as invalid on 2018/01/30 23:29

Sample crash report:
general protection fault, probably for non-canonical address 0xe00000201ffffd40: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x00002100ffffea00-0x00002100ffffea07]
CPU: 0 PID: 8428 Comm: syz-executor Not tainted 5.12.0-rc8-next-20210423-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:find_entry.isra.0+0xdd/0x1e0 fs/proc/proc_sysctl.c:122
Code: 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 d1 00 00 00 49 89 dc 4d 2b 66 40 49 c1 fc 05 49 c1 e4 06 49 01 ec 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 0f 85 a0 00 00 00 49 8b 2c 24 48 89 ef e8 0c 3e fb
RSP: 0018:ffffc9000167f840 EFLAGS: 00010202
RAX: 000004201ffffd40 RBX: ffff888024c40050 RCX: 0000000000000000
RDX: ffff88802530b900 RSI: ffffffff81eef73f RDI: ffff888024c40040
RBP: 00002100ffffea00 R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff81eef705 R11: 0000000000000000 R12: 00002100ffffea00
R13: dffffc0000000000 R14: ffff888024c40000 R15: 0000000000000010
FS:  00000000028e9400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004af0b8 CR3: 000000001a187000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lookup_entry fs/proc/proc_sysctl.c:339 [inline]
 proc_sys_lookup+0x171/0x590 fs/proc/proc_sysctl.c:512
 lookup_open.isra.0+0x69f/0x13d0 fs/namei.c:3193
 open_last_lookups fs/namei.c:3285 [inline]
 path_openat+0x9af/0x27d0 fs/namei.c:3491
 do_filp_open+0x190/0x3d0 fs/namei.c:3521
 do_sys_openat2+0x16d/0x420 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1214
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x419667
Code: 25 00 00 41 00 3d 00 00 41 00 74 47 64 8b 04 25 18 00 00 00 85 c0 75 6b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 95 00 00 00 48 8b 4c 24 28 64 48 2b 0c 25
RSP: 002b:00007ffd2d55d2d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 0000000000419667
RDX: 0000000000080001 RSI: 00000000004af1d0 RDI: 00000000ffffff9c
RBP: 00000000004af1d0 R08: 0000000000000000 R09: 00007ffd2d55d2c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080001
R13: 00007ffd2d55d370 R14: 0000000000000000 R15: 0000000000400538
Modules linked in:
---[ end trace 804386bbb2e8477f ]---
RIP: 0010:find_entry.isra.0+0xdd/0x1e0 fs/proc/proc_sysctl.c:122
Code: 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 d1 00 00 00 49 89 dc 4d 2b 66 40 49 c1 fc 05 49 c1 e4 06 49 01 ec 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 0f 85 a0 00 00 00 49 8b 2c 24 48 89 ef e8 0c 3e fb
RSP: 0018:ffffc9000167f840 EFLAGS: 00010202
RAX: 000004201ffffd40 RBX: ffff888024c40050 RCX: 0000000000000000
RDX: ffff88802530b900 RSI: ffffffff81eef73f RDI: ffff888024c40040
RBP: 00002100ffffea00 R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff81eef705 R11: 0000000000000000 R12: 00002100ffffea00
R13: dffffc0000000000 R14: ffff888024c40000 R15: 0000000000000010
FS:  00000000028e9400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004af0b8 CR3: 000000001a187000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2021/05/02 18:39 linux-next e3d35712f85a 77e2b668 .config log report info general protection fault in find_entry
* Struck through repros no longer work on HEAD.