general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 PID: 276 Comm: jfsCommit Not tainted 5.15.156-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] RIP: 0010:lmLogSync+0x12c/0xad0 fs/jfs/jfs_logmgr.c:943 Code: c3 fe 49 8d 5f f0 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 12 58 e5 fe 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 f5 57 e5 fe 48 8b 3b e8 cd 22 c3 RSP: 0018:ffffc90002c57c20 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: a7acf93c7dfc8d00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002c57d38 R08: ffffffff81a7e9e6 R09: ffffc90002c57b88 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888079d39800 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff888077371838 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f95db50e988 CR3: 00000000231d7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: jfs_syncpt+0x79/0x90 fs/jfs/jfs_logmgr.c:1049 txEnd+0x30b/0x560 fs/jfs/jfs_txnmgr.c:549 txLazyCommit fs/jfs/jfs_txnmgr.c:2718 [inline] jfs_lazycommit+0x60d/0xc30 fs/jfs/jfs_txnmgr.c:2766 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300 Modules linked in: ---[ end trace ab9bd87627ce5feb ]--- RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] RIP: 0010:lmLogSync+0x12c/0xad0 fs/jfs/jfs_logmgr.c:943 Code: c3 fe 49 8d 5f f0 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 12 58 e5 fe 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 f5 57 e5 fe 48 8b 3b e8 cd 22 c3 RSP: 0018:ffffc90002c57c20 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: a7acf93c7dfc8d00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002c57d38 R08: ffffffff81a7e9e6 R09: ffffc90002c57b88 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888079d39800 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff888077371838 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000080 CR3: 0000000016bd4000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c3 ret 1: fe 49 8d decb -0x73(%rcx) 4: 5f pop %rdi 5: f0 48 89 d8 lock mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 12 58 e5 fe call 0xfee5582e 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 30 add $0x30,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 f5 57 e5 fe call 0xfee5582e 39: 48 8b 3b mov (%rbx),%rdi 3c: e8 .byte 0xe8 3d: cd 22 int $0x22 3f: c3 ret