syzbot


WARNING in vfs_removexattr (2)

Status: moderation: reported on 2024/08/19 22:16
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+ad9ca5fa6f83171e3bb9@syzkaller.appspotmail.com
First crash: 60d, last: 34d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in vfs_removexattr 1 152d 152d 0/3 auto-obsoleted due to no activity on 2024/08/24 01:07
linux-6.1 WARNING in vfs_removexattr 7 47d 73d 0/3 upstream: reported on 2024/08/03 02:57
upstream WARNING in vfs_removexattr fs 2 175d 174d 0/28 auto-obsoleted due to no activity on 2024/07/22 12:52

Sample crash report:
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff0000ee7cb658, owner = 0x0, curr 0xffff0000d59fbc80, list empty
WARNING: CPU: 0 PID: 8601 at kernel/locking/rwsem.c:1370 __up_write kernel/locking/rwsem.c:1369 [inline]
WARNING: CPU: 0 PID: 8601 at kernel/locking/rwsem.c:1370 up_write+0x524/0x760 kernel/locking/rwsem.c:1632
Modules linked in:
CPU: 0 UID: 0 PID: 8601 Comm: syz.3.352 Not tainted 6.11.0-rc5-syzkaller-gdf54f4a16f82 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __up_write kernel/locking/rwsem.c:1369 [inline]
pc : up_write+0x524/0x760 kernel/locking/rwsem.c:1632
lr : __up_write kernel/locking/rwsem.c:1369 [inline]
lr : up_write+0x524/0x760 kernel/locking/rwsem.c:1632
sp : ffff8000a12c7960
x29: ffff8000a12c79e0 x28: 1ffff00014258f50 x27: 1fffe0001dcf96d8
x26: dfff800000000000 x25: 1fffe0001dcf96cc x24: ffff0000ee7cb6b0
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000d59fbc80
x20: ffff0000ee7cb658 x19: ffff0000ee7cb658 x18: ffff8000a12c6ea0
x17: 0000000000044b5a x16: ffff800080345a84 x15: 0000000000000001
x14: 1ffff00011fbc252 x13: 0000000000000000 x12: 0000000000000003
x11: 0000000000040000 x10: 0000000000000003 x9 : 85824f1bf041c600
x8 : 85824f1bf041c600 x7 : ffff8000800605c8 x6 : ffff8000800607c4
x5 : ffff0000d2ef9ac8 x4 : ffff8000a12c72f8 x3 : 0000000000000000
x2 : 0000000000000007 x1 : ffff80008b462a00 x0 : ffff800124878000
Call trace:
 __up_write kernel/locking/rwsem.c:1369 [inline]
 up_write+0x524/0x760 kernel/locking/rwsem.c:1632
 inode_unlock include/linux/fs.h:804 [inline]
 vfs_removexattr+0xec/0x23c fs/xattr.c:577
 removexattr fs/xattr.c:907 [inline]
 path_removexattr+0x230/0x32c fs/xattr.c:928
 __do_sys_removexattr fs/xattr.c:942 [inline]
 __se_sys_removexattr fs/xattr.c:939 [inline]
 __arm64_sys_removexattr+0x60/0x78 fs/xattr.c:939
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
irq event stamp: 376
hardirqs last  enabled at (375): [<ffff8000803e5a8c>] __call_rcu_common kernel/rcu/tree.c:3128 [inline]
hardirqs last  enabled at (375): [<ffff8000803e5a8c>] call_rcu+0x648/0xb08 kernel/rcu/tree.c:3210
hardirqs last disabled at (376): [<ffff80008b2ee35c>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:470
softirqs last  enabled at (352): [<ffff8000801f77b8>] softirq_handle_end kernel/softirq.c:400 [inline]
softirqs last  enabled at (352): [<ffff8000801f77b8>] handle_softirqs+0xa3c/0xbfc kernel/softirq.c:582
softirqs last disabled at (253): [<ffff800080020de8>] __do_softirq+0x14/0x20 kernel/softirq.c:588
---[ end trace 0000000000000000 ]---

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/10 17:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci df54f4a16f82 784df80e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in vfs_removexattr
2024/08/15 22:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 7c626ce4bae1 e4bacdaf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in vfs_removexattr
* Struck through repros no longer work on HEAD.