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BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: null-ptr-deref in set_buffer_uptodate include/linux/buffer_head.h:149 [inline]
BUG: KASAN: null-ptr-deref in do_journal_end+0x10cf/0x4860 fs/reiserfs/journal.c:4086
Read of size 8 at addr 0000000000000000 by task syz.3.673/10370

CPU: 0 PID: 10370 Comm: syz.3.673 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x288/0x290 mm/kasan/generic.c:187
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 set_buffer_uptodate include/linux/buffer_head.h:149 [inline]
 do_journal_end+0x10cf/0x4860 fs/reiserfs/journal.c:4086
 reiserfs_sync_fs+0xd0/0x150 fs/reiserfs/super.c:78
 sync_filesystem+0x1c2/0x220 fs/sync.c:66
 reiserfs_remount+0x14e/0x14c0 fs/reiserfs/super.c:1445
 reconfigure_super+0x21e/0x880 fs/super.c:1151
 do_remount fs/namespace.c:2927 [inline]
 path_mount+0xd19/0xfe0 fs/namespace.c:3705
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f54ef590eea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f54ed7f5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f54ed7f5ef0 RCX: 00007f54ef590eea
RDX: 0000200000000f40 RSI: 0000200000000f00 RDI: 0000000000000000
RBP: 0000200000000f40 R08: 00007f54ed7f5ef0 R09: 0000000001a4a438
R10: 0000000001a4a438 R11: 0000000000000246 R12: 0000200000000f00
R13: 00007f54ed7f5eb0 R14: 0000000000000000 R15: 0000200000000100
 </TASK>
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