syzbot

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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 gfs2_drop_inode+0x20c/0x3a0 fs/gfs2/super.c:1052
Read of size 8 at addr 00000000000000a8 by task syz-executor322/5858

CPU: 0 UID: 0 PID: 5858 Comm: syz-executor322 Not tainted 6.15.0-syzkaller-11061-g7f9039c524a3 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 gfs2_drop_inode+0x20c/0x3a0 fs/gfs2/super.c:1052
 iput_final fs/inode.c:1868 [inline]
 iput+0x45d/0x9d0 fs/inode.c:1924
 gfs2_fill_super+0x1418/0x2010 fs/gfs2/ops_fstype.c:1314
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1679
 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1333
 vfs_get_tree+0x92/0x2b0 fs/super.c:1802
 do_new_mount+0x24a/0xa40 fs/namespace.c:3856
 do_mount fs/namespace.c:4193 [inline]
 __do_sys_mount fs/namespace.c:4404 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4381
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fec93895c5a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 8e 04 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe55450bf8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fec93895c5a
RDX: 0000200000000240 RSI: 0000200000001c00 RDI: 00007ffe55450c50
RBP: 0000000000000004 R08: 00007ffe55450c90 R09: 00000000000125dc
R10: 0000000001000800 R11: 0000000000000282 R12: 0000000001000000
R13: 00007ffe55450c90 R14: 0000200000001c00 R15: 0000000000000003
 </TASK>
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