BUG: stack guard page was hit at ffffc90000c5fff8 (stack is ffffc90000c60000..ffffc90000c67fff) kernel stack overflow (double-fault): 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 14845 Comm: syz-executor.5 Not tainted 5.10.102-syzkaller-00171-ge1b86e7f5cbb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__unwind_start+0x8/0x420 arch/x86/kernel/unwind_frame.c:365 Code: ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 3f fe ff ff e8 5b d4 72 00 e9 35 fe ff ff e8 91 b7 61 03 90 55 48 89 e5 41 57 41 56 <41> 55 41 54 53 48 83 ec 50 48 89 4d d0 49 89 d7 49 89 f6 49 89 fd RSP: 0018:ffffc90000c60000 EFLAGS: 00010246 RAX: ffff88810b8f3b40 RBX: 1ffff9200018c022 RCX: ffffc90000c600b0 RDX: 0000000000000000 RSI: ffff88810b8f3b40 RDI: ffffc90000c60020 RBP: ffffc90000c60010 R08: dffffc0000000000 R09: ffffc90000c60100 R10: fffff5200018c023 R11: 0000000000000000 R12: ffff88810b8f3b40 R13: ffffffff815bee70 R14: ffffc90000c60100 R15: 0000000000000000 FS: 00007f5156d1f700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90000c5fff8 CR3: 0000000105f89000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_start arch/x86/include/asm/unwind.h:60 [inline] arch_stack_walk+0xdc/0x140 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x11b/0x1e0 kernel/stacktrace.c:121 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:428 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:461 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:583 [inline] slab_alloc_node mm/slub.c:2954 [inline] slab_alloc mm/slub.c:2962 [inline] kmem_cache_alloc+0x1a2/0x380 mm/slub.c:2967 __d_alloc+0x2d/0x6b0 fs/dcache.c:1709 d_alloc fs/dcache.c:1788 [inline] d_alloc_parallel+0xf3/0x1360 fs/dcache.c:2540 __lookup_slow+0x14e/0x400 fs/namei.c:1613 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_one_len+0x17f/0x2c0 fs/namei.c:2642 incfs_lookup_dentry+0x5f/0xb0 fs/incfs/data_mgmt.c:212 dir_lookup+0x3b8/0x6e0 fs/incfs/vfs.c:967 __lookup_slow+0x2b3/0x400 fs/namei.c:1628 lookup_slow fs/namei.c:1645 [inline] walk_component+0x516/0x790 fs/namei.c:1940 lookup_last fs/namei.c:2389 [inline] path_lookupat+0x19d/0x6c0 fs/namei.c:2413 filename_lookup+0x23f/0x6c0 fs/namei.c:2446 user_path_at_empty+0x40/0x50 fs/namei.c:2726 user_path_at include/linux/namei.h:59 [inline] __do_sys_chdir fs/open.c:492 [inline] __se_sys_chdir+0x9c/0x230 fs/open.c:486 __x64_sys_chdir+0x38/0x40 fs/open.c:486 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f5157ba9049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5156d1f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000050 RAX: ffffffffffffffda RBX: 00007f5157cbbf60 RCX: 00007f5157ba9049 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 00007f5157c0308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc6a90993f R14: 00007f5156d1f300 R15: 0000000000022000 Modules linked in: ---[ end trace 50312f98b4bab3b7 ]--- RIP: 0010:__unwind_start+0x8/0x420 arch/x86/kernel/unwind_frame.c:365 Code: ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 3f fe ff ff e8 5b d4 72 00 e9 35 fe ff ff e8 91 b7 61 03 90 55 48 89 e5 41 57 41 56 <41> 55 41 54 53 48 83 ec 50 48 89 4d d0 49 89 d7 49 89 f6 49 89 fd RSP: 0018:ffffc90000c60000 EFLAGS: 00010246 RAX: ffff88810b8f3b40 RBX: 1ffff9200018c022 RCX: ffffc90000c600b0 RDX: 0000000000000000 RSI: ffff88810b8f3b40 RDI: ffffc90000c60020 RBP: ffffc90000c60010 R08: dffffc0000000000 R09: ffffc90000c60100 R10: fffff5200018c023 R11: 0000000000000000 R12: ffff88810b8f3b40 R13: ffffffff815bee70 R14: ffffc90000c60100 R15: 0000000000000000 FS: 00007f5156d1f700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90000c5fff8 CR3: 0000000105f89000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff 89 f9 80 e1 07 decl 0x7e180f9(%rcx) 6: 80 c1 03 add $0x3,%cl 9: 38 c1 cmp %al,%cl b: 0f 8c 3f fe ff ff jl 0xfffffe50 11: e8 5b d4 72 00 callq 0x72d471 16: e9 35 fe ff ff jmpq 0xfffffe50 1b: e8 91 b7 61 03 callq 0x361b7b1 20: 90 nop 21: 55 push %rbp 22: 48 89 e5 mov %rsp,%rbp 25: 41 57 push %r15 27: 41 56 push %r14 * 29: 41 55 push %r13 <-- trapping instruction 2b: 41 54 push %r12 2d: 53 push %rbx 2e: 48 83 ec 50 sub $0x50,%rsp 32: 48 89 4d d0 mov %rcx,-0x30(%rbp) 36: 49 89 d7 mov %rdx,%r15 39: 49 89 f6 mov %rsi,%r14 3c: 49 89 fd mov %rdi,%r13