================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: null-ptr-deref in atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:705 [inline] BUG: KASAN: null-ptr-deref in queued_spin_lock include/asm-generic/qspinlock.h:82 [inline] BUG: KASAN: null-ptr-deref in do_raw_spin_lock include/linux/spinlock.h:183 [inline] BUG: KASAN: null-ptr-deref in __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] BUG: KASAN: null-ptr-deref in _raw_spin_lock+0x96/0x1b0 kernel/locking/spinlock.c:151 Write of size 4 at addr 0000000000000098 by task syz-executor.4/23064 CPU: 1 PID: 23064 Comm: syz-executor.4 Tainted: G W 5.10.100-syzkaller-00843-g86e6176a4240 #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 __kasan_report+0x138/0x220 mm/kasan/report.c:423 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] incfs_fresh_pending_reads_exist+0x32/0xe0 fs/incfs/data_mgmt.c:1738 pending_reads_poll+0x13a/0x170 fs/incfs/pseudo_files.c:113 vfs_poll include/linux/poll.h:90 [inline] do_pollfd fs/select.c:872 [inline] do_poll fs/select.c:920 [inline] do_sys_poll+0x8b2/0x12f0 fs/select.c:1014 __do_sys_ppoll fs/select.c:1120 [inline] __se_sys_ppoll+0x29c/0x330 fs/select.c:1100 __x64_sys_ppoll+0xbf/0xd0 fs/select.c:1100 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f8b3c3bc059 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:00007f8b3b532168 EFLAGS: 00000246 ORIG_RAX: 000000000000010f RAX: ffffffffffffffda RBX: 00007f8b3c4cef60 RCX: 00007f8b3c3bc059 RDX: 0000000020000140 RSI: 0000000000000001 RDI: 0000000020000100 RBP: 00007f8b3c41608d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe880018ef R14: 00007f8b3b532300 R15: 0000000000022000 ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000098 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 1498a9067 P4D 1498a9067 PUD 10fd41067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 23064 Comm: syz-executor.4 Tainted: G B W 5.10.100-syzkaller-00843-g86e6176a4240 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:202 [inline] RIP: 0010:atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:707 [inline] RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:82 [inline] RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:183 [inline] RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] RIP: 0010:_raw_spin_lock+0xb8/0x1b0 kernel/locking/spinlock.c:151 Code: 00 00 00 e8 7a 8f 08 fd 4c 89 ff be 04 00 00 00 e8 6d 8f 08 fd 43 8a 04 26 84 c0 0f 85 a9 00 00 00 8b 44 24 20 b9 01 00 00 00 41 0f b1 4d 00 75 33 48 c7 04 24 0e 36 e0 45 49 c7 04 1c 00 00 RSP: 0018:ffffc90000d07740 EFLAGS: 00010297 RAX: 0000000000000000 RBX: 1ffff920001a0ee8 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000d07760 RBP: ffffc90000d077d8 R08: dffffc0000000000 R09: 0000000000000003 R10: fffff520001a0eed R11: 0000000000000004 R12: dffffc0000000000 R13: 0000000000000098 R14: 1ffff920001a0eec R15: ffffc90000d07760 FS: 00007f8b3b532700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000098 CR3: 000000011c8ae000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: spin_lock include/linux/spinlock.h:354 [inline] incfs_fresh_pending_reads_exist+0x32/0xe0 fs/incfs/data_mgmt.c:1738 pending_reads_poll+0x13a/0x170 fs/incfs/pseudo_files.c:113 vfs_poll include/linux/poll.h:90 [inline] do_pollfd fs/select.c:872 [inline] do_poll fs/select.c:920 [inline] do_sys_poll+0x8b2/0x12f0 fs/select.c:1014 __do_sys_ppoll fs/select.c:1120 [inline] __se_sys_ppoll+0x29c/0x330 fs/select.c:1100 __x64_sys_ppoll+0xbf/0xd0 fs/select.c:1100 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f8b3c3bc059 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:00007f8b3b532168 EFLAGS: 00000246 ORIG_RAX: 000000000000010f RAX: ffffffffffffffda RBX: 00007f8b3c4cef60 RCX: 00007f8b3c3bc059 RDX: 0000000020000140 RSI: 0000000000000001 RDI: 0000000020000100 RBP: 00007f8b3c41608d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe880018ef R14: 00007f8b3b532300 R15: 0000000000022000 Modules linked in: CR2: 0000000000000098 ---[ end trace 354173403a1039ee ]--- RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:202 [inline] RIP: 0010:atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:707 [inline] RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:82 [inline] RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:183 [inline] RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] RIP: 0010:_raw_spin_lock+0xb8/0x1b0 kernel/locking/spinlock.c:151 Code: 00 00 00 e8 7a 8f 08 fd 4c 89 ff be 04 00 00 00 e8 6d 8f 08 fd 43 8a 04 26 84 c0 0f 85 a9 00 00 00 8b 44 24 20 b9 01 00 00 00 41 0f b1 4d 00 75 33 48 c7 04 24 0e 36 e0 45 49 c7 04 1c 00 00 RSP: 0018:ffffc90000d07740 EFLAGS: 00010297 RAX: 0000000000000000 RBX: 1ffff920001a0ee8 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000d07760 RBP: ffffc90000d077d8 R08: dffffc0000000000 R09: 0000000000000003 R10: fffff520001a0eed R11: 0000000000000004 R12: dffffc0000000000 R13: 0000000000000098 R14: 1ffff920001a0eec R15: ffffc90000d07760 FS: 00007f8b3b532700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000098 CR3: 000000011c8ae000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 e8 add %ch,%al 4: 7a 8f jp 0xffffff95 6: 08 fd or %bh,%ch 8: 4c 89 ff mov %r15,%rdi b: be 04 00 00 00 mov $0x4,%esi 10: e8 6d 8f 08 fd callq 0xfd088f82 15: 43 8a 04 26 mov (%r14,%r12,1),%al 19: 84 c0 test %al,%al 1b: 0f 85 a9 00 00 00 jne 0xca 21: 8b 44 24 20 mov 0x20(%rsp),%eax 25: b9 01 00 00 00 mov $0x1,%ecx * 2a: f0 41 0f b1 4d 00 lock cmpxchg %ecx,0x0(%r13) <-- trapping instruction 30: 75 33 jne 0x65 32: 48 c7 04 24 0e 36 e0 movq $0x45e0360e,(%rsp) 39: 45 3a: 49 rex.WB 3b: c7 .byte 0xc7 3c: 04 1c add $0x1c,%al