loop0: detected capacity change from 0 to 2048 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted 6.12.0-rc6-syzkaller-00272-gda4373fbcf00 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:perf_trace_block_buffer+0x293/0x490 include/trace/events/block.h:24 Code: 24 18 48 8d 58 30 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 1b 49 62 fd 4c 8b 3b 49 83 c7 34 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 6c 01 00 00 45 8b 3f 49 8d 5c 24 08 48 RSP: 0018:ffffc9000d74f3e0 EFLAGS: 00010207 RAX: 0000000000000006 RBX: ffff8880433955a0 RCX: 0000000000040000 RDX: ffffc9000d8c1000 RSI: 0000000000005b5a RDI: ffff88801fc37928 RBP: ffffc9000d74f4d8 R08: ffffffff819e736b R09: 1ffffffff203a13d R10: dffffc0000000000 R11: fffffbfff203a13e R12: ffffe8ffffc40f50 R13: dffffc0000000000 R14: ffff88801fc378a0 R15: 0000000000000034 FS: 00007fab650df6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcfcafbfc8 CR3: 0000000040694000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_block_touch_buffer include/trace/events/block.h:54 [inline] touch_buffer+0x1d5/0x240 fs/buffer.c:64 __nilfs_get_folio_block fs/nilfs2/page.c:42 [inline] nilfs_grab_buffer+0x321/0x440 fs/nilfs2/page.c:61 nilfs_mdt_submit_block+0xdc/0x890 fs/nilfs2/mdt.c:121 nilfs_mdt_read_block+0xeb/0x430 fs/nilfs2/mdt.c:176 nilfs_mdt_get_block+0x127/0xb70 fs/nilfs2/mdt.c:251 nilfs_sufile_read+0x274/0x4c0 fs/nilfs2/sufile.c:1254 nilfs_load_super_root fs/nilfs2/the_nilfs.c:128 [inline] load_nilfs+0x6b0/0x1090 fs/nilfs2/the_nilfs.c:299 nilfs_fill_super+0x31e/0x720 fs/nilfs2/super.c:1067 nilfs_get_tree+0x4f9/0x920 fs/nilfs2/super.c:1220 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fab6437feba 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:00007fab650dee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fab650deef0 RCX: 00007fab6437feba RDX: 0000000020005980 RSI: 0000000020000300 RDI: 00007fab650deeb0 RBP: 0000000020005980 R08: 00007fab650deef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000300 R13: 00007fab650deeb0 R14: 0000000000000aca R15: 00000000200002c0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:perf_trace_block_buffer+0x293/0x490 include/trace/events/block.h:24 Code: 24 18 48 8d 58 30 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 1b 49 62 fd 4c 8b 3b 49 83 c7 34 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 6c 01 00 00 45 8b 3f 49 8d 5c 24 08 48 RSP: 0018:ffffc9000d74f3e0 EFLAGS: 00010207 RAX: 0000000000000006 RBX: ffff8880433955a0 RCX: 0000000000040000 RDX: ffffc9000d8c1000 RSI: 0000000000005b5a RDI: ffff88801fc37928 RBP: ffffc9000d74f4d8 R08: ffffffff819e736b R09: 1ffffffff203a13d R10: dffffc0000000000 R11: fffffbfff203a13e R12: ffffe8ffffc40f50 R13: dffffc0000000000 R14: ffff88801fc378a0 R15: 0000000000000034 FS: 00007fab650df6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcfcafbfc8 CR3: 0000000040694000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 24 18 and $0x18,%al 2: 48 8d 58 30 lea 0x30(%rax),%rbx 6: 48 89 d8 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 1b 49 62 fd call 0xfd624937 1c: 4c 8b 3b mov (%rbx),%r15 1f: 49 83 c7 34 add $0x34,%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 6c 01 00 00 jne 0x1a3 37: 45 8b 3f mov (%r15),%r15d 3a: 49 8d 5c 24 08 lea 0x8(%r12),%rbx 3f: 48 rex.W