syzbot


WARNING in do_mknodat (3)

Status: upstream: reported on 2024/10/06 10:51
Reported-by: syzbot+3fd0cea8c9d8df19c688@syzkaller.appspotmail.com
First crash: 32d, last: 22d
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in do_mknodat fs 1 685d 630d 0/28 closed as invalid on 2023/02/16 16:02
upstream WARNING in do_mknodat (3) fs 116 15d 251d 0/28 moderation: reported on 2024/03/01 11:23
linux-6.1 WARNING in do_mknodat 1 371d 371d 0/3 auto-obsoleted due to no activity on 2024/02/10 13:02
upstream WARNING in do_mknodat (2) fs 11 355d 623d 0/28 auto-obsoleted due to no activity on 2024/02/16 05:28
linux-6.1 WARNING in do_mknodat (2) 39 138d 205d 0/3 auto-obsoleted due to no activity on 2024/08/30 19:08
linux-5.15 WARNING in do_mknodat (3) 1 20d 20d 0/3 upstream: reported on 2024/10/17 18:39
linux-5.15 WARNING in do_mknodat (2) 4 159d 336d 0/3 auto-obsoleted due to no activity on 2024/09/08 20:03
linux-5.15 WARNING in do_mknodat 1 448d 448d 0/3 auto-obsoleted due to no activity on 2023/11/25 05:54

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888070e10330, owner = 0x0, curr 0xffff88802cb75940, list empty
WARNING: CPU: 0 PID: 3988 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 0 PID: 3988 at kernel/locking/rwsem.c:1372 up_write+0x4f5/0x580 kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 0 PID: 3988 Comm: syz.2.41 Not tainted 6.1.112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__up_write kernel/locking/rwsem.c:1371 [inline]
RIP: 0010:up_write+0x4f5/0x580 kernel/locking/rwsem.c:1626
Code: 48 c7 c7 e0 f6 0b 8b 48 c7 c6 20 f9 0b 8b 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 7f cd e8 ff 48 83 c4 08 <0f> 0b e9 71 fd ff ff 48 c7 c1 28 2e 9a 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000405fd20 EFLAGS: 00010292
RAX: ad93ed9203a70100 RBX: ffffffff8b0bf7c0 RCX: 0000000000040000
RDX: ffffc9000bc0a000 RSI: 000000000001d1f3 RDI: 000000000001d1f4
RBP: ffffc9000405fdf0 R08: ffffffff8152a48e R09: fffff5200080bf05
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff888070e10330 R14: 1ffff9200080bfac R15: dffffc0000000000
FS:  00007fda9a5bd6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f61bff8 CR3: 0000000058f44000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:763 [inline]
 done_path_create fs/namei.c:3929 [inline]
 do_mknodat+0x44f/0x5a0 fs/namei.c:4052
 __do_sys_mknod fs/namei.c:4070 [inline]
 __se_sys_mknod fs/namei.c:4068 [inline]
 __x64_sys_mknod+0x8a/0xa0 fs/namei.c:4068
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fda9a77dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fda9a5bd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fda9a936130 RCX: 00007fda9a77dff9
RDX: 0000000000000704 RSI: 0000000000000000 RDI: 000000002009e000
RBP: 00007fda9a7f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fda9a936130 R15: 00007ffe03ce8ab8
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/06 10:50 linux-6.1.y aa4cd140bba5 d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in do_mknodat
2024/10/16 00:16 linux-6.1.y aa4cd140bba5 bde2d81c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in do_mknodat
2024/10/10 04:17 linux-6.1.y aa4cd140bba5 0278d004 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in do_mknodat
* Struck through repros no longer work on HEAD.