syzbot


WARNING in __generic_file_fsync (2)

Status: moderation: reported on 2024/11/07 03:53
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+9ee00aab5d7d98d5fa1b@syzkaller.appspotmail.com
First crash: 32d, last: 32d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in __generic_file_fsync 1 581d 581d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:03
linux-5.15 WARNING in __generic_file_fsync (2) 1 334d 330d 0/3 auto-obsoleted due to no activity on 2024/04/15 05:26
upstream WARNING in __generic_file_fsync fs 1 650d 646d 0/28 auto-obsoleted due to no activity on 2023/05/24 22:02

Sample crash report:
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888064fb11d8, owner = 0x0, curr 0xffff8880680d8000, list empty
WARNING: CPU: 1 PID: 6019 at kernel/locking/rwsem.c:1368 __up_write kernel/locking/rwsem.c:1367 [inline]
WARNING: CPU: 1 PID: 6019 at kernel/locking/rwsem.c:1368 up_write+0x502/0x590 kernel/locking/rwsem.c:1630
Modules linked in:
CPU: 1 UID: 0 PID: 6019 Comm: syz.0.11 Not tainted 6.12.0-rc5-syzkaller-00308-g3e5e6c9900c3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__up_write kernel/locking/rwsem.c:1367 [inline]
RIP: 0010:up_write+0x502/0x590 kernel/locking/rwsem.c:1630
Code: c7 c7 00 be 0a 8c 48 c7 c6 80 c0 0a 8c 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 53 e8 43 3f e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6a fd ff ff 48 c7 c1 70 0f 1c 90 80 e1 07 80 c1 03
RSP: 0018:ffffc9000aeffd80 EFLAGS: 00010292
RAX: 0f6c269dc5daa600 RBX: ffffffff8c0abee0 RCX: 0000000000040000
RDX: ffffc9000e264000 RSI: 00000000000076f3 RDI: 00000000000076f4
RBP: ffffc9000aeffe48 R08: ffffffff8155d162 R09: 1ffffffff2037ba5
R10: dffffc0000000000 R11: fffffbfff2037ba6 R12: 0000000000000000
R13: ffff888064fb11d8 R14: 1ffff920015dffb8 R15: dffffc0000000000
FS:  00007f8222dbf6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8222d9df98 CR3: 000000002dd76000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:820 [inline]
 __generic_file_fsync+0x152/0x1a0 fs/libfs.c:1544
 generic_file_fsync+0x70/0xf0 fs/libfs.c:1569
 vfs_fsync_range fs/sync.c:188 [inline]
 vfs_fsync fs/sync.c:202 [inline]
 do_fsync fs/sync.c:212 [inline]
 __do_sys_fsync fs/sync.c:220 [inline]
 __se_sys_fsync fs/sync.c:218 [inline]
 __x64_sys_fsync+0x18f/0x1f0 fs/sync.c:218
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8221f7e719
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:00007f8222dbf038 EFLAGS: 00000246 ORIG_RAX: 000000000000004a
RAX: ffffffffffffffda RBX: 00007f8222136208 RCX: 00007f8221f7e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f8221ff132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8222136208 R15: 00007ffc87757b98
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/03 03:45 upstream 3e5e6c9900c3 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in __generic_file_fsync
* Struck through repros no longer work on HEAD.