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BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: null-ptr-deref in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
BUG: KASAN: null-ptr-deref in set_buffer_uptodate include/linux/buffer_head.h:147 [inline]
BUG: KASAN: null-ptr-deref in do_journal_end+0xf99/0x42d0 fs/reiserfs/journal.c:4079
Read of size 8 at addr 0000000000000000 by task syz.6.737/7465

CPU: 1 PID: 7465 Comm: syz.6.737 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:438 [inline]
 kasan_report+0xd5/0x130 mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 set_buffer_uptodate include/linux/buffer_head.h:147 [inline]
 do_journal_end+0xf99/0x42d0 fs/reiserfs/journal.c:4079
 do_journal_begin_r+0xa36/0x1010 fs/reiserfs/journal.c:-1
 journal_begin+0x148/0x350 fs/reiserfs/journal.c:3253
 reiserfs_fill_super+0x1654/0x23e0 fs/reiserfs/super.c:2108
 mount_bdev+0x287/0x3c0 fs/super.c:1400
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3014
 do_mount fs/namespace.c:3357 [inline]
 __do_sys_mount fs/namespace.c:3565 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3542
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f95a8ec338a
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:00007f95a7128e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f95a7128ef0 RCX: 00007f95a8ec338a
RDX: 0000200000000000 RSI: 00002000000000c0 RDI: 00007f95a7128eb0
RBP: 0000200000000000 R08: 00007f95a7128ef0 R09: 0000000000000400
R10: 0000000000000400 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007f95a7128eb0 R14: 00000000000010fd R15: 0000200000000180
 </TASK>
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