syzbot

lmLogOpen: exit(-22)
jfs_dirty_inode called on read-only volume
Is remount racy?
jfs_dirty_inode called on read-only volume
Is remount racy?
Unable to handle kernel paging request at virtual address dfff800000000008
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
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
[dfff800000000008] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4508 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
pc : txBeginAnon+0xac/0x154 fs/jfs/jfs_txnmgr.c:466
lr : spin_lock include/linux/spinlock.h:351 [inline]
lr : txBeginAnon+0x78/0x154 fs/jfs/jfs_txnmgr.c:459
sp : ffff8000213172c0
x29: ffff8000213172c0 x28: ffff80001c5e0208 x27: ffff80001c5e0000
x26: ffff80001c5e0000 x25: 0000000000000008 x24: 0000000000000150
x23: dfff800000000000 x22: 0000000000000001 x21: 0000000000000000
x20: 0000000000000040 x19: ffff8000157f0800 x18: ffff800011babf60
x17: ffff80001836c000 x16: ffff8000082eeba4 x15: ffff800017e4d000
x14: ffff700004262e40 x13: 1ffff00004262e40 x12: 0000000000000004
x11: ffffffffffffffff x10: dfff800000000000 x9 : 4e30633fbadab000
x8 : 4e30633fbadab000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff800018522740 x4 : 0000000000000008 x3 : ffff8000082eeccc
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 spin_lock include/linux/spinlock.h:351 [inline]
 txBeginAnon+0xac/0x154 fs/jfs/jfs_txnmgr.c:-1
 extAlloc+0xdc/0xdb8 fs/jfs/jfs_extent.c:78
 jfs_get_block+0x2c4/0x8c0 fs/jfs/inode.c:254
 __block_write_begin_int+0x350/0x1388 fs/buffer.c:1991
 __block_write_begin fs/buffer.c:2041 [inline]
 block_write_begin+0x98/0x11c fs/buffer.c:2102
 jfs_write_begin+0x44/0x88 fs/jfs/inode.c:310
 generic_perform_write+0x234/0x4f4 mm/filemap.c:3862
 __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960
 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:3989
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x53c/0x940 fs/read_write.c:861
 vfs_writev fs/read_write.c:934 [inline]
 do_pwritev+0x1e8/0x338 fs/read_write.c:1031
 __do_sys_pwritev2 fs/read_write.c:1090 [inline]
 __se_sys_pwritev2 fs/read_write.c:1081 [inline]
 __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1081
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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
Code: aa1803e0 97ffff73 aa1303e0 959ca4e2 (38776b28) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	aa1803e0 	mov	x0, x24
   4:	97ffff73 	bl	0xfffffffffffffdd0
   8:	aa1303e0 	mov	x0, x19
   c:	959ca4e2 	bl	0x6729394
* 10:	38776b28 	ldrb	w8, [x25, x23] <-- trapping instruction