Oops: general protection fault, probably for non-canonical address 0xdffffc0000000020: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000100-0x0000000000000107] CPU: 1 UID: 0 PID: 8031 Comm: syz.0.659 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:gfs2_quota_lock+0x103/0x7b0 fs/gfs2/quota.c:1105 Code: 00 00 4d 89 fd 49 c1 ed 03 41 80 7c 1d 00 00 74 08 4c 89 ff e8 1e fd e7 fd 49 8b 3f 48 8d 87 00 01 00 00 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 0f 85 c9 05 00 00 8b b7 00 01 00 00 ba 08 00 00 RSP: 0018:ffffc90002fb78d0 EFLAGS: 00010202 RAX: 0000000000000100 RBX: dffffc0000000000 RCX: 0000000000000020 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff907a487f R09: 1ffffffff20f490f R10: dffffc0000000000 R11: fffffbfff20f4910 R12: ffff88804ae4c620 R13: 1ffff110095c9959 R14: 00000000ffffffff R15: ffff88804ae4cac8 FS: 00007f48b5e586c0(0000) GS:ffff888124dcd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbe603f6d58 CR3: 000000007e8ac000 CR4: 00000000003526f0 Call Trace: gfs2_quota_lock_check fs/gfs2/quota.h:50 [inline] do_grow fs/gfs2/bmap.c:2117 [inline] gfs2_setattr_size+0x9df/0x1270 fs/gfs2/bmap.c:2198 gfs2_setattr+0x269/0x430 fs/gfs2/inode.c:2138 notify_change+0xbba/0xea0 fs/attr.c:556 do_truncate+0x1c2/0x250 fs/open.c:68 vfs_truncate+0x4b4/0x540 fs/open.c:118 ksys_truncate+0xf3/0x1c0 fs/open.c:142 __do_sys_truncate fs/open.c:154 [inline] __se_sys_truncate fs/open.c:152 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:152 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f48b4f9e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f48b5e58028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f48b5225fa0 RCX: 00007f48b4f9e159 RDX: 0000000000000000 RSI: 000000000008fff5 RDI: 0000200000000180 RBP: 00007f48b5035024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f48b5226038 R14: 00007f48b5225fa0 R15: 00007fff320b3d58 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:gfs2_quota_lock+0x103/0x7b0 fs/gfs2/quota.c:1105 Code: 00 00 4d 89 fd 49 c1 ed 03 41 80 7c 1d 00 00 74 08 4c 89 ff e8 1e fd e7 fd 49 8b 3f 48 8d 87 00 01 00 00 48 89 c1 48 c1 e9 03 <0f> b6 0c 19 84 c9 0f 85 c9 05 00 00 8b b7 00 01 00 00 ba 08 00 00 RSP: 0018:ffffc90002fb78d0 EFLAGS: 00010202 RAX: 0000000000000100 RBX: dffffc0000000000 RCX: 0000000000000020 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff907a487f R09: 1ffffffff20f490f R10: dffffc0000000000 R11: fffffbfff20f4910 R12: ffff88804ae4c620 R13: 1ffff110095c9959 R14: 00000000ffffffff R15: ffff88804ae4cac8 FS: 00007f48b5e586c0(0000) GS:ffff888124dcd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbe603f6d58 CR3: 000000007e8ac000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4d 89 fd mov %r15,%r13 5: 49 c1 ed 03 shr $0x3,%r13 9: 41 80 7c 1d 00 00 cmpb $0x0,0x0(%r13,%rbx,1) f: 74 08 je 0x19 11: 4c 89 ff mov %r15,%rdi 14: e8 1e fd e7 fd call 0xfde7fd37 19: 49 8b 3f mov (%r15),%rdi 1c: 48 8d 87 00 01 00 00 lea 0x100(%rdi),%rax 23: 48 89 c1 mov %rax,%rcx 26: 48 c1 e9 03 shr $0x3,%rcx * 2a: 0f b6 0c 19 movzbl (%rcx,%rbx,1),%ecx <-- trapping instruction 2e: 84 c9 test %cl,%cl 30: 0f 85 c9 05 00 00 jne 0x5ff 36: 8b b7 00 01 00 00 mov 0x100(%rdi),%esi 3c: ba .byte 0xba 3d: 08 00 or %al,(%rax)