loop0: detected capacity change from 0 to 32768 Oops: divide error: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 6447 Comm: syz.0.264 Not tainted 6.11.0-syzkaller-07462-g1868f9d0260e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:div_u64_rem include/linux/math64.h:29 [inline] RIP: 0010:div_u64 include/linux/math64.h:130 [inline] RIP: 0010:__bch2_strtou64_h fs/bcachefs/util.c:143 [inline] RIP: 0010:__bch2_strtoh+0xb59/0xeb0 fs/bcachefs/util.c:168 Code: ff 0f 88 8f 00 00 00 4c 89 74 24 08 44 89 f8 48 01 c5 48 89 2c 24 e8 d6 6a 4c fd 4d 89 e6 44 89 e1 48 c7 c0 ff ff ff ff 31 d2 <48> f7 f1 48 89 c5 48 8b 5c 24 18 48 89 df 48 89 c6 e8 11 6d 4c fd RSP: 0018:ffffc9000475f8e8 EFLAGS: 00010246 RAX: ffffffffffffffff RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000875 RDI: 0000000000000876 RBP: ffff888030bd0722 R08: ffffffff844853dd R09: 0000000000000000 R10: 0000000000000009 R11: ffff88802d2a9e00 R12: 1000000000000000 R13: ffff888030bd0720 R14: 1000000000000000 R15: 0000000000000001 FS: 00007f8779b596c0(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8778d61060 CR3: 000000006bf1e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bch2_strtou64_h+0xa5/0x120 fs/bcachefs/util.c:205 bch2_opt_parse+0x2dd/0x4c0 fs/bcachefs/opts.c:353 bch2_parse_one_mount_opt+0x2d3/0x5e0 fs/bcachefs/opts.c:501 bch2_fs_parse_param+0x137/0x180 fs/bcachefs/fs.c:2095 vfs_parse_fs_param+0x1a5/0x420 fs/fs_context.c:146 vfs_parse_fs_string fs/fs_context.c:188 [inline] vfs_parse_monolithic_sep fs/fs_context.c:230 [inline] generic_parse_monolithic+0x2c8/0x400 fs/fs_context.c:258 do_new_mount+0x28f/0xb40 fs/namespace.c:3503 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 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: 0033:0x7f8778d7f69a 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:00007f8779b58e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f8779b58ef0 RCX: 00007f8778d7f69a RDX: 0000000020000040 RSI: 000000002000f680 RDI: 00007f8779b58eb0 RBP: 0000000020000040 R08: 00007f8779b58ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000002000f680 R13: 00007f8779b58eb0 R14: 000000000000f633 R15: 00000000200000c0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:div_u64_rem include/linux/math64.h:29 [inline] RIP: 0010:div_u64 include/linux/math64.h:130 [inline] RIP: 0010:__bch2_strtou64_h fs/bcachefs/util.c:143 [inline] RIP: 0010:__bch2_strtoh+0xb59/0xeb0 fs/bcachefs/util.c:168 Code: ff 0f 88 8f 00 00 00 4c 89 74 24 08 44 89 f8 48 01 c5 48 89 2c 24 e8 d6 6a 4c fd 4d 89 e6 44 89 e1 48 c7 c0 ff ff ff ff 31 d2 <48> f7 f1 48 89 c5 48 8b 5c 24 18 48 89 df 48 89 c6 e8 11 6d 4c fd RSP: 0018:ffffc9000475f8e8 EFLAGS: 00010246 RAX: ffffffffffffffff RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000875 RDI: 0000000000000876 RBP: ffff888030bd0722 R08: ffffffff844853dd R09: 0000000000000000 R10: 0000000000000009 R11: ffff88802d2a9e00 R12: 1000000000000000 R13: ffff888030bd0720 R14: 1000000000000000 R15: 0000000000000001 FS: 00007f8779b596c0(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc297f08178 CR3: 000000006bf1e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: ff 0f decl (%rdi) 2: 88 8f 00 00 00 4c mov %cl,0x4c000000(%rdi) 8: 89 74 24 08 mov %esi,0x8(%rsp) c: 44 89 f8 mov %r15d,%eax f: 48 01 c5 add %rax,%rbp 12: 48 89 2c 24 mov %rbp,(%rsp) 16: e8 d6 6a 4c fd call 0xfd4c6af1 1b: 4d 89 e6 mov %r12,%r14 1e: 44 89 e1 mov %r12d,%ecx 21: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax 28: 31 d2 xor %edx,%edx * 2a: 48 f7 f1 div %rcx <-- trapping instruction 2d: 48 89 c5 mov %rax,%rbp 30: 48 8b 5c 24 18 mov 0x18(%rsp),%rbx 35: 48 89 df mov %rbx,%rdi 38: 48 89 c6 mov %rax,%rsi 3b: e8 11 6d 4c fd call 0xfd4c6d51