BUG: stack guard page was hit at ffffc9000784fff8 (stack is ffffc90007850000..ffffc90007857fff) kernel stack overflow (double-fault): 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 9484 Comm: syz-executor.0 Not tainted 5.10.108-syzkaller-00653-gab2d1d40a128 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:unwind_start arch/x86/include/asm/unwind.h:60 [inline] RIP: 0010:arch_stack_walk+0xd7/0x140 arch/x86/kernel/stacktrace.c:24 Code: eb 1b 65 48 8b 04 25 80 6d 02 00 4c 39 e0 74 0a 49 8b 8c 24 98 0e 00 00 eb 03 48 89 e9 48 8d bd 70 ff ff ff 4c 89 e6 4c 89 fa f4 17 06 00 83 bd 70 ff ff ff 00 74 36 48 8d 9d 70 ff ff ff 0f RSP: 0018:ffffc90007850000 EFLAGS: 00010246 RAX: ffff88811212cf00 RBX: 1ffff92000f0a01e RCX: ffffc90007850090 RDX: 0000000000000000 RSI: ffff88811212cf00 RDI: ffffc90007850000 RBP: ffffc90007850090 R08: dffffc0000000000 R09: ffffc900078500e0 R10: fffff52000f0a01f R11: 0000000000000000 R12: ffff88811212cf00 R13: ffffffff815bf690 R14: ffffc900078500e0 R15: 0000000000000000 FS: 00007fa7331bc700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc9000784fff8 CR3: 000000011c06d000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:2956 [inline] slab_alloc mm/slub.c:2964 [inline] kmem_cache_alloc+0x1a2/0x380 mm/slub.c:2969 __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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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:211 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_fchownat+0xed/0x240 fs/open.c:699 __do_sys_lchown fs/open.c:730 [inline] __se_sys_lchown fs/open.c:728 [inline] __x64_sys_lchown+0x85/0x90 fs/open.c:728 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fa734088049 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:00007fa7331bc168 EFLAGS: 00000246 ORIG_RAX: 000000000000005e RAX: ffffffffffffffda RBX: 00007fa73419b100 RCX: 00007fa734088049 RDX: ffffffffffffffff RSI: ffffffffffffffff RDI: 0000000020000180 RBP: 00007fa7340e208d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc1ed9bfcf R14: 00007fa7331bc300 R15: 0000000000022000 Modules linked in: ---[ end trace 59c52b5068d2da1f ]--- RIP: 0010:unwind_start arch/x86/include/asm/unwind.h:60 [inline] RIP: 0010:arch_stack_walk+0xd7/0x140 arch/x86/kernel/stacktrace.c:24 Code: eb 1b 65 48 8b 04 25 80 6d 02 00 4c 39 e0 74 0a 49 8b 8c 24 98 0e 00 00 eb 03 48 89 e9 48 8d bd 70 ff ff ff 4c 89 e6 4c 89 fa f4 17 06 00 83 bd 70 ff ff ff 00 74 36 48 8d 9d 70 ff ff ff 0f RSP: 0018:ffffc90007850000 EFLAGS: 00010246 RAX: ffff88811212cf00 RBX: 1ffff92000f0a01e RCX: ffffc90007850090 RDX: 0000000000000000 RSI: ffff88811212cf00 RDI: ffffc90007850000 RBP: ffffc90007850090 R08: dffffc0000000000 R09: ffffc900078500e0 R10: fffff52000f0a01f R11: 0000000000000000 R12: ffff88811212cf00 R13: ffffffff815bf690 R14: ffffc900078500e0 R15: 0000000000000000 FS: 00007fa7331bc700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc9000784fff8 CR3: 000000011c06d000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: eb 1b jmp 0x1d 2: 65 48 8b 04 25 80 6d mov %gs:0x26d80,%rax 9: 02 00 b: 4c 39 e0 cmp %r12,%rax e: 74 0a je 0x1a 10: 49 8b 8c 24 98 0e 00 mov 0xe98(%r12),%rcx 17: 00 18: eb 03 jmp 0x1d 1a: 48 89 e9 mov %rbp,%rcx 1d: 48 8d bd 70 ff ff ff lea -0x90(%rbp),%rdi 24: 4c 89 e6 mov %r12,%rsi 27: 4c 89 fa mov %r15,%rdx * 2a: e8 f4 17 06 00 callq 0x61823 <-- trapping instruction 2f: 83 bd 70 ff ff ff 00 cmpl $0x0,-0x90(%rbp) 36: 74 36 je 0x6e 38: 48 8d 9d 70 ff ff ff lea -0x90(%rbp),%rbx 3f: 0f .byte 0xf