syzbot


BUG: unable to handle kernel paging request in ext4_xattr_set_handle (2)

Status: auto-obsoleted due to no activity on 2023/04/26 11:24
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+5c7caec159b2f588de6c@syzkaller.appspotmail.com
First crash: 512d, last: 512d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel paging request in ext4_xattr_set_handle ext4 1 614d 613d 0/27 auto-obsoleted due to no activity on 2023/01/15 00:17

Sample crash report:
Unable to handle kernel paging request at virtual address 1fff80000378c250
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[1fff80000378c250] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4766 Comm: syz-executor.4 Not tainted 6.2.0-rc5-syzkaller-17291-g2e84eedb182e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
pstate: 004000c5 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
pc : __lock_acquire+0x654/0x3084 kernel/locking/lockdep.c:5025
lr : mark_usage kernel/locking/lockdep.c:4555 [inline]
lr : __lock_acquire+0x630/0x3084 kernel/locking/lockdep.c:5009
sp : ffff80001420b6c0
x29: ffff80001420b7a0 x28: 0000000000000002 x27: ffff00011c05b450
x26: ffff00011c05be20 x25: ffff00011c05be40 x24: ffff00011c05be40
x23: 00000000000000c0
 x22: 0000000000000001
 x21: 0000000000000000

x20: ffff00011c05b400
 x19: 555554aaac1987fe
 x18: 00000000000000c0

x17: ffff80000df59158
 x16: ffff80000dd97118
 x15: ffff00011c05b400

x14: 00000000000000f8
 x13: 00000000ffffffff
 x12: ffff80000df59158

x11: ffff80000df59158
 x10: ffff80000df59158
 x9 : 1ffffffff58330f8

x8 : 0000000000000000
 x7 : ffff800008876fd0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000008 x1 : ffff00011c05be20 x0 : 0000000000000001
Call trace:
 generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
 __lock_acquire+0x654/0x3084 kernel/locking/lockdep.c:5025
 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668
 down_write+0x5c/0x88 kernel/locking/rwsem.c:1562
 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
 ext4_xattr_set_handle+0xd0/0x9a0 fs/ext4/xattr.c:2320
 ext4_xattr_set+0x104/0x1d4 fs/ext4/xattr.c:2507
 ext4_xattr_security_set+0x4c/0x64 fs/ext4/xattr_security.c:31
 __vfs_setxattr+0x290/0x29c fs/xattr.c:202
 __vfs_setxattr_noperm+0xcc/0x320 fs/xattr.c:236
 __vfs_setxattr_locked+0x16c/0x194 fs/xattr.c:297
 vfs_setxattr+0xf4/0x1f4 fs/xattr.c:323
 do_setxattr fs/xattr.c:608 [inline]
 setxattr fs/xattr.c:631 [inline]
 path_setxattr+0x32c/0x424 fs/xattr.c:650
 __do_sys_lsetxattr fs/xattr.c:673 [inline]
 __se_sys_lsetxattr fs/xattr.c:669 [inline]
 __arm64_sys_lsetxattr+0x2c/0x40 fs/xattr.c:669
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x104 arch/arm64/kernel/syscall.c:193
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
Code: 350000e8 93407e69 d343fd29 927de529 (f8696949) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	350000e8 	cbnz	w8, 0x1c
   4:	93407e69 	sxtw	x9, w19
   8:	d343fd29 	lsr	x9, x9, #3
   c:	927de529 	and	x9, x9, #0x1ffffffffffffff8
* 10:	f8696949 	ldr	x9, [x10, x9] <-- trapping instruction

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/26 11:24 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 2e84eedb182e 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in ext4_xattr_set_handle
* Struck through repros no longer work on HEAD.