syzbot


WARNING in vfs_removexattr (3)

Status: upstream: reported on 2025/09/30 13:48
Reported-by: syzbot+3e7b6c43d0cfcc861658@syzkaller.appspotmail.com
First crash: 121d, last: 29d
Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in vfs_removexattr (2) -1 1 251d 251d 0/3 auto-obsoleted due to no activity on 2025/08/31 13:54
linux-5.15 WARNING in vfs_removexattr -1 1 623d 623d 0/3 auto-obsoleted due to no activity on 2024/08/24 01:07
linux-6.1 WARNING in vfs_removexattr -1 7 519d 544d 0/3 auto-obsoleted due to no activity on 2024/12/06 14:45
linux-6.1 WARNING in vfs_removexattr (2) -1 3 352d 381d 0/3 auto-obsoleted due to no activity on 2025/05/22 15:47
upstream WARNING in vfs_removexattr (2) fs -1 2 506d 528d 0/29 auto-obsoleted due to no activity on 2024/12/09 17:38
linux-6.6 WARNING in vfs_removexattr -1 1 154d 154d 0/2 auto-obsoleted due to no activity on 2025/12/07 00:25
upstream WARNING in vfs_removexattr fs -1 2 646d 646d 0/29 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 = 0xffff0000f57a0e50, owner = 0x0, curr 0xffff0000cbf93780, list empty
WARNING: CPU: 0 PID: 5082 at kernel/locking/rwsem.c:1372 __up_write kernel/locking/rwsem.c:1371 [inline]
WARNING: CPU: 0 PID: 5082 at kernel/locking/rwsem.c:1372 up_write+0x494/0x5c0 kernel/locking/rwsem.c:1626
Modules linked in:
CPU: 0 PID: 5082 Comm: syz.1.139 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __up_write kernel/locking/rwsem.c:1371 [inline]
pc : up_write+0x494/0x5c0 kernel/locking/rwsem.c:1626
lr : __up_write kernel/locking/rwsem.c:1371 [inline]
lr : up_write+0x494/0x5c0 kernel/locking/rwsem.c:1626
sp : ffff800022ce7a80
x29: ffff800022ce7a90 x28: ffff0000cbf93780 x27: ffff800022ce7b40
x26: dfff800000000000 x25: 1fffe0001eaf41d7 x24: ffff0000f57a0ea8
x23: 0000000000000000 x22: 0000000000000000 x21: ffff0000cbf93780
x20: ffff0000f57a0e50 x19: ffff0000f57a0e50 x18: ffff800011a5bd40
x17: 0000000000000000 x16: ffff8000082d3a08 x15: 0000000000000002
x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000080000
x11: 00000000000071c4 x10: ffff8000256ca000 x9 : 5ddad1bd91f0bf00
x8 : 5ddad1bd91f0bf00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800022ce7518 x4 : ffff800015134e00 x3 : ffff80000852f9b8
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000
Call trace:
 __up_write kernel/locking/rwsem.c:1371 [inline]
 up_write+0x494/0x5c0 kernel/locking/rwsem.c:1626
 inode_unlock include/linux/fs.h:763 [inline]
 vfs_removexattr+0x8c/0x190 fs/xattr.c:538
 removexattr fs/xattr.c:878 [inline]
 path_removexattr+0x188/0x31c fs/xattr.c:892
 __do_sys_removexattr fs/xattr.c:906 [inline]
 __se_sys_removexattr fs/xattr.c:903 [inline]
 __arm64_sys_removexattr+0x60/0x78 fs/xattr.c:903
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 138568
hardirqs last  enabled at (138567): [<ffff800008309b4c>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261
hardirqs last disabled at (138568): [<ffff8000118fa220>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (138520): [<ffff8000080309e0>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (138518): [<ffff8000080309ac>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/31 01:32 linux-6.1.y 50cbba13faa2 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in vfs_removexattr
2025/09/30 13:47 linux-6.1.y 7b34dc04e4ff 86341da6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in vfs_removexattr
* Struck through repros no longer work on HEAD.