================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:705 [inline] BUG: KASAN: use-after-free in queued_spin_lock include/asm-generic/qspinlock.h:82 [inline] BUG: KASAN: use-after-free in do_raw_spin_lock include/linux/spinlock.h:183 [inline] BUG: KASAN: use-after-free in __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] BUG: KASAN: use-after-free in _raw_spin_lock+0x96/0x1b0 kernel/locking/spinlock.c:151 Write of size 4 at addr ffff888156d15004 by task syz-executor.5/15978 CPU: 1 PID: 15978 Comm: syz-executor.5 Not tainted 5.10.76-syzkaller-01178-g4944ec82ebb9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x8d/0x3d0 mm/kasan/report.c:233 __kasan_report+0x142/0x220 mm/kasan/report.c:419 kasan_report+0x51/0x70 mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:135 [inline] kasan_check_range+0x2b6/0x2f0 mm/kasan/generic.c:186 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:705 [inline] queued_spin_lock include/asm-generic/qspinlock.h:82 [inline] do_raw_spin_lock include/linux/spinlock.h:183 [inline] __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x96/0x1b0 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] chroot_fs_refs+0xe8/0x4b0 fs/fs_struct.c:70 __do_sys_pivot_root fs/namespace.c:3792 [inline] __se_sys_pivot_root+0x1e6d/0x1f90 fs/namespace.c:3709 __x64_sys_pivot_root+0x5b/0x70 fs/namespace.c:3709 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fe03fa58ae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe03d7cf188 EFLAGS: 00000246 ORIG_RAX: 000000000000009b RAX: ffffffffffffffda RBX: 00007fe03fb6bf60 RCX: 00007fe03fa58ae9 RDX: 0000000000000000 RSI: 00000000200004c0 RDI: 0000000020000340 RBP: 00007fe03fab2f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5bdd7d2f R14: 00007fe03d7cf300 R15: 0000000000022000 Allocated by task 382: 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:2948 [inline] slab_alloc mm/slub.c:2956 [inline] kmem_cache_alloc+0x1a2/0x380 mm/slub.c:2961 copy_fs_struct+0x4e/0x230 fs/fs_struct.c:114 copy_fs kernel/fork.c:1489 [inline] copy_process+0x13bc/0x5330 kernel/fork.c:2137 kernel_clone+0x21f/0x9a0 kernel/fork.c:2507 __do_sys_clone kernel/fork.c:2626 [inline] __se_sys_clone kernel/fork.c:2610 [inline] __x64_sys_clone+0x258/0x2d0 kernel/fork.c:2610 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888156d15000 which belongs to the cache fs_cache of size 56 The buggy address is located 4 bytes inside of 56-byte region [ffff888156d15000, ffff888156d15038) The buggy address belongs to the page: page:ffffea00055b4540 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888156d15c80 pfn:0x156d15 flags: 0x8000000000000200(slab) raw: 8000000000000200 ffffea00045a1b40 0000000600000006 ffff888100066480 raw: ffff888156d15c80 0000000080200000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 383, ts 260627176068, free_ts 260619141589 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2385 [inline] prep_new_page mm/page_alloc.c:2391 [inline] get_page_from_freelist+0xa74/0xa90 mm/page_alloc.c:4063 __alloc_pages_nodemask+0x3c8/0x820 mm/page_alloc.c:5106 alloc_slab_page mm/slub.c:1807 [inline] allocate_slab+0x6b/0x350 mm/slub.c:1809 new_slab mm/slub.c:1870 [inline] new_slab_objects mm/slub.c:2629 [inline] ___slab_alloc+0x143/0x2f0 mm/slub.c:2792 __slab_alloc mm/slub.c:2832 [inline] slab_alloc_node mm/slub.c:2914 [inline] slab_alloc mm/slub.c:2956 [inline] kmem_cache_alloc+0x26f/0x380 mm/slub.c:2961 copy_fs_struct+0x4e/0x230 fs/fs_struct.c:114 copy_fs kernel/fork.c:1489 [inline] copy_process+0x13bc/0x5330 kernel/fork.c:2137 kernel_clone+0x21f/0x9a0 kernel/fork.c:2507 __do_sys_clone kernel/fork.c:2626 [inline] __se_sys_clone kernel/fork.c:2610 [inline] __x64_sys_clone+0x258/0x2d0 kernel/fork.c:2610 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1331 [inline] free_pcp_prepare+0x18f/0x1c0 mm/page_alloc.c:1405 free_unref_page_prepare mm/page_alloc.c:3291 [inline] free_unref_page mm/page_alloc.c:3341 [inline] free_the_page mm/page_alloc.c:5165 [inline] __free_pages+0x2e3/0x4a0 mm/page_alloc.c:5173 __free_slab+0xdf/0x1a0 mm/slub.c:1895 free_slab mm/slub.c:1910 [inline] discard_slab mm/slub.c:1916 [inline] __slab_free+0x458/0x4e0 mm/slub.c:3132 do_slab_free mm/slub.c:3192 [inline] ___cache_free+0x131/0x150 mm/slub.c:3211 qlink_free+0x38/0x40 mm/kasan/quarantine.c:146 qlist_free_all mm/kasan/quarantine.c:165 [inline] kasan_quarantine_reduce+0x178/0x1d0 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:438 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:583 [inline] slab_alloc_node mm/slub.c:2948 [inline] slab_alloc mm/slub.c:2956 [inline] kmem_cache_alloc_trace+0x1a5/0x3a0 mm/slub.c:2973 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] kernfs_iop_get_link+0x65/0x5c0 fs/kernfs/symlink.c:135 vfs_readlink+0x17b/0x420 fs/namei.c:4627 do_readlinkat+0x28f/0x3b0 fs/stat.c:427 __do_sys_readlink fs/stat.c:448 [inline] __se_sys_readlink fs/stat.c:445 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:445 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Memory state around the buggy address: ffff888156d14f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888156d14f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888156d15000: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ^ ffff888156d15080: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ffff888156d15100: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ================================================================== ================================================================================ UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.c:130:9 index 16382 is out of range for type 'unsigned long [8]' CPU: 1 PID: 15978 Comm: syz-executor.5 Tainted: G B 5.10.76-syzkaller-01178-g4944ec82ebb9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 dump_stack+0x15/0x1d lib/dump_stack.c:135 ubsan_epilogue lib/ubsan.c:148 [inline] __ubsan_handle_out_of_bounds+0x107/0x160 lib/ubsan.c:356 decode_tail kernel/locking/qspinlock.c:130 [inline] __pv_queued_spin_lock_slowpath+0xc9b/0xcf0 kernel/locking/qspinlock.c:468 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock include/linux/spinlock.h:183 [inline] __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x136/0x1b0 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] chroot_fs_refs+0xe8/0x4b0 fs/fs_struct.c:70 __do_sys_pivot_root fs/namespace.c:3792 [inline] __se_sys_pivot_root+0x1e6d/0x1f90 fs/namespace.c:3709 __x64_sys_pivot_root+0x5b/0x70 fs/namespace.c:3709 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fe03fa58ae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe03d7cf188 EFLAGS: 00000246 ORIG_RAX: 000000000000009b RAX: ffffffffffffffda RBX: 00007fe03fb6bf60 RCX: 00007fe03fa58ae9 RDX: 0000000000000000 RSI: 00000000200004c0 RDI: 0000000020000340 RBP: 00007fe03fab2f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5bdd7d2f R14: 00007fe03d7cf300 R15: 0000000000022000 ================================================================================ general protection fault, probably for non-canonical address 0xe01c72659fd7e3ba: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0x00e3b32cfebf1dd0-0x00e3b32cfebf1dd7] CPU: 1 PID: 15978 Comm: syz-executor.5 Tainted: G B 5.10.76-syzkaller-01178-g4944ec82ebb9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__pv_queued_spin_lock_slowpath+0x2e4/0xcf0 kernel/locking/qspinlock.c:471 Code: 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ef e8 71 ba 53 00 49 03 5d 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 4c 8b 6c 24 20 74 08 48 89 df e8 e9 ba 53 00 4c 89 2b RSP: 0018:ffffc9000200fac0 EFLAGS: 00010202 RAX: 001c76659fd7e3ba RBX: 00e3b32cfebf1dd1 RCX: dffffc0000000000 RDX: ffffc90004736000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc9000200fbb0 R08: ffffffff82714cec R09: fffff52000401e79 R10: fffff52000401e79 R11: 0000000000000000 R12: ffff888156d15004 R13: ffffffff85d70670 R14: 1ffff1103ee29e11 R15: 1ffff1102ada2a00 FS: 00007fe03d7cf700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000164d1d000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:85 [inline] do_raw_spin_lock include/linux/spinlock.h:183 [inline] __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x136/0x1b0 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] chroot_fs_refs+0xe8/0x4b0 fs/fs_struct.c:70 __do_sys_pivot_root fs/namespace.c:3792 [inline] __se_sys_pivot_root+0x1e6d/0x1f90 fs/namespace.c:3709 __x64_sys_pivot_root+0x5b/0x70 fs/namespace.c:3709 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fe03fa58ae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe03d7cf188 EFLAGS: 00000246 ORIG_RAX: 000000000000009b RAX: ffffffffffffffda RBX: 00007fe03fb6bf60 RCX: 00007fe03fa58ae9 RDX: 0000000000000000 RSI: 00000000200004c0 RDI: 0000000020000340 RBP: 00007fe03fab2f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5bdd7d2f R14: 00007fe03d7cf300 R15: 0000000000022000 Modules linked in: ---[ end trace 7ab40b37aa8211aa ]--- RIP: 0010:__pv_queued_spin_lock_slowpath+0x2e4/0xcf0 kernel/locking/qspinlock.c:471 Code: 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 ef e8 71 ba 53 00 49 03 5d 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 4c 8b 6c 24 20 74 08 48 89 df e8 e9 ba 53 00 4c 89 2b RSP: 0018:ffffc9000200fac0 EFLAGS: 00010202 RAX: 001c76659fd7e3ba RBX: 00e3b32cfebf1dd1 RCX: dffffc0000000000 RDX: ffffc90004736000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc9000200fbb0 R08: ffffffff82714cec R09: fffff52000401e79 R10: fffff52000401e79 R11: 0000000000000000 R12: ffff888156d15004 R13: ffffffff85d70670 R14: 1ffff1103ee29e11 R15: 1ffff1102ada2a00 FS: 00007fe03d7cf700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000164d1d000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 6 bytes skipped: 0: df 80 3c 08 00 74 filds 0x7400083c(%rax) 6: 08 4c 89 ef or %cl,-0x11(%rcx,%rcx,4) a: e8 71 ba 53 00 callq 0x53ba80 f: 49 03 5d 00 add 0x0(%r13),%rbx 13: 48 89 d8 mov %rbx,%rax 16: 48 c1 e8 03 shr $0x3,%rax 1a: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 21: fc ff df * 24: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 28: 4c 8b 6c 24 20 mov 0x20(%rsp),%r13 2d: 74 08 je 0x37 2f: 48 89 df mov %rbx,%rdi 32: e8 e9 ba 53 00 callq 0x53bb20 37: 4c 89 2b mov %r13,(%rbx)