Hello, syzbot found the following issue on: HEAD commit: fdcbcd1348f4 Add linux-next specific files for 20220331 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1583bdb9700000 kernel config: https://syzkaller.appspot.com/x/.config?x=366ab475940a4177 dashboard link: https://syzkaller.appspot.com/bug?extid=51175d2754e4b4c04d6d compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+51175d2754e4b4c04d6d@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 3906 Comm: syz-executor.2 Not tainted 5.17.0-next-20220331-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bio_free+0xc3/0x120 block/bio.c:233 Code: 6e 48 8b 73 78 48 8d bd d0 00 00 00 e8 46 fe ff ff 48 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 8d 75 18 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 20 8b 45 08 48 83 c4 08 48 29 c3 RSP: 0018:ffffc9000528fac0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88807c8c5c00 RCX: ffffc9000c212000 RDX: 0000000000000001 RSI: 0000000000000018 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff83d576a5 R11: 0000000000000004 R12: 0000000000000060 R13: 0000000000000060 R14: 0000000000001000 R15: 0000000000000060 FS: 00007f068de1f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555631d848 CR3: 0000000077fb2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bio_put+0x20e/0x3b0 block/bio.c:754 squashfs_read_data+0x2ce/0xed0 fs/squashfs/block.c:221 squashfs_read_table+0x184/0x1f0 fs/squashfs/cache.c:432 squashfs_fill_super+0x337/0x2690 fs/squashfs/super.c:184 get_tree_bdev+0x440/0x760 fs/super.c:1292 vfs_get_tree+0x89/0x2f0 fs/super.c:1497 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1320/0x1fa0 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f068cc8a57a Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 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:00007f068de1ef88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f068cc8a57a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f068de1efe0 RBP: 00007f068de1f020 R08: 00007f068de1f020 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f068de1efe0 R15: 0000000020000140 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bio_free+0xc3/0x120 block/bio.c:233 Code: 6e 48 8b 73 78 48 8d bd d0 00 00 00 e8 46 fe ff ff 48 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 8d 75 18 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 20 8b 45 08 48 83 c4 08 48 29 c3 RSP: 0018:ffffc9000528fac0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88807c8c5c00 RCX: ffffc9000c212000 RDX: 0000000000000001 RSI: 0000000000000018 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff83d576a5 R11: 0000000000000004 R12: 0000000000000060 R13: 0000000000000060 R14: 0000000000001000 R15: 0000000000000060 FS: 00007f068de1f700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557421b87a30 CR3: 0000000077fb2000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 6e outsb %ds:(%rsi),(%dx) 1: 48 8b 73 78 mov 0x78(%rbx),%rsi 5: 48 8d bd d0 00 00 00 lea 0xd0(%rbp),%rdi c: e8 46 fe ff ff callq 0xfffffe57 11: 48 8d 7d 08 lea 0x8(%rbp),%rdi 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 8d 75 18 lea 0x18(%rbp),%rsi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 04 je 0x36 32: 3c 03 cmp $0x3,%al 34: 7e 20 jle 0x56 36: 8b 45 08 mov 0x8(%rbp),%eax 39: 48 83 c4 08 add $0x8,%rsp 3d: 48 29 c3 sub %rax,%rbx --- This report is generated by a bot. 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