================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: null-ptr-deref in atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:142 [inline] BUG: KASAN: null-ptr-deref in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: null-ptr-deref in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: null-ptr-deref in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: null-ptr-deref in get_task_struct include/linux/sched/task.h:108 [inline] BUG: KASAN: null-ptr-deref in kthread_stop+0x3b/0x410 kernel/kthread.c:640 Write of size 4 at addr 0000000000000020 by task syz-executor691/325 CPU: 1 PID: 325 Comm: syz-executor691 Not tainted 5.10.234-syzkaller-00033-g094fc3778d6b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 __kasan_report mm/kasan/report.c:439 [inline] kasan_report+0x167/0x1c0 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:142 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] get_task_struct include/linux/sched/task.h:108 [inline] kthread_stop+0x3b/0x410 kernel/kthread.c:640 f2fs_stop_gc_thread+0x65/0xb0 fs/f2fs/gc.c:199 f2fs_ioc_shutdown fs/f2fs/file.c:2361 [inline] __f2fs_ioctl+0x7830/0xda80 fs/f2fs/file.c:4330 f2fs_ioctl+0x170/0x550 fs/f2fs/file.c:4415 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0x114/0x190 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f819769c089 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8197637168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f81977296d8 RCX: 00007f819769c089 RDX: 0000200000000140 RSI: 000000008004587d RDI: 0000000000000005 RBP: 00007f81977296d0 R08: 00007f81976376c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f81977296dc R13: 000000000000006e R14: 00007ffc0fbdff00 R15: 00007ffc0fbdffe8 ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000020 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 0 PID: 325 Comm: syz-executor691 Tainted: G B 5.10.234-syzkaller-00033-g094fc3778d6b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:arch_atomic_fetch_add include/linux/instrumented.h:-1 [inline] RIP: 0010:atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:143 [inline] RIP: 0010:__refcount_add include/linux/refcount.h:193 [inline] RIP: 0010:__refcount_inc include/linux/refcount.h:250 [inline] RIP: 0010:refcount_inc include/linux/refcount.h:267 [inline] RIP: 0010:get_task_struct include/linux/sched/task.h:108 [inline] RIP: 0010:kthread_stop+0x40/0x410 kernel/kthread.c:640 Code: 00 fc ff df e8 31 26 24 00 0f 1f 44 00 00 e8 27 26 24 00 4d 8d 74 24 20 4c 89 f7 be 04 00 00 00 e8 55 c7 61 00 bb 01 00 00 00 41 0f c1 5c 24 20 31 ff 89 de e8 b0 29 24 00 85 db 0f 84 2f 01 RSP: 0018:ffffc90000de7838 EFLAGS: 00010246 RAX: ffff88810c911300 RBX: 0000000000000001 RCX: ffff88810c9113c0 RDX: 0000000000000000 RSI: 0000000000000282 RDI: 00000000ffffffff RBP: ffffc90000de7860 R08: ffffffff813e2b8b R09: 0000000000000003 R10: fffffbfff0e11248 R11: dffffc0000000001 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000020 R15: dffffc0000000000 FS: 00007f81976376c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000020 CR3: 000000011d703000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_stop_gc_thread+0x65/0xb0 fs/f2fs/gc.c:199 f2fs_ioc_shutdown fs/f2fs/file.c:2361 [inline] __f2fs_ioctl+0x7830/0xda80 fs/f2fs/file.c:4330 f2fs_ioctl+0x170/0x550 fs/f2fs/file.c:4415 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0x114/0x190 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f819769c089 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8197637168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f81977296d8 RCX: 00007f819769c089 RDX: 0000200000000140 RSI: 000000008004587d RDI: 0000000000000005 RBP: 00007f81977296d0 R08: 00007f81976376c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f81977296dc R13: 000000000000006e R14: 00007ffc0fbdff00 R15: 00007ffc0fbdffe8 Modules linked in: CR2: 0000000000000020 ---[ end trace 4ec8bd11c35cfc07 ]--- RIP: 0010:arch_atomic_fetch_add include/linux/instrumented.h:-1 [inline] RIP: 0010:atomic_fetch_add_relaxed include/asm-generic/atomic-instrumented.h:143 [inline] RIP: 0010:__refcount_add include/linux/refcount.h:193 [inline] RIP: 0010:__refcount_inc include/linux/refcount.h:250 [inline] RIP: 0010:refcount_inc include/linux/refcount.h:267 [inline] RIP: 0010:get_task_struct include/linux/sched/task.h:108 [inline] RIP: 0010:kthread_stop+0x40/0x410 kernel/kthread.c:640 Code: 00 fc ff df e8 31 26 24 00 0f 1f 44 00 00 e8 27 26 24 00 4d 8d 74 24 20 4c 89 f7 be 04 00 00 00 e8 55 c7 61 00 bb 01 00 00 00 41 0f c1 5c 24 20 31 ff 89 de e8 b0 29 24 00 85 db 0f 84 2f 01 RSP: 0018:ffffc90000de7838 EFLAGS: 00010246 RAX: ffff88810c911300 RBX: 0000000000000001 RCX: ffff88810c9113c0 RDX: 0000000000000000 RSI: 0000000000000282 RDI: 00000000ffffffff RBP: ffffc90000de7860 R08: ffffffff813e2b8b R09: 0000000000000003 R10: fffffbfff0e11248 R11: dffffc0000000001 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000020 R15: dffffc0000000000 FS: 00007f81976376c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000020 CR3: 000000011d703000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df e8 fucomip %st(0),%st 2: 31 26 xor %esp,(%rsi) 4: 24 00 and $0x0,%al 6: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) b: e8 27 26 24 00 call 0x242637 10: 4d 8d 74 24 20 lea 0x20(%r12),%r14 15: 4c 89 f7 mov %r14,%rdi 18: be 04 00 00 00 mov $0x4,%esi 1d: e8 55 c7 61 00 call 0x61c777 22: bb 01 00 00 00 mov $0x1,%ebx * 27: f0 41 0f c1 5c 24 20 lock xadd %ebx,0x20(%r12) <-- trapping instruction 2e: 31 ff xor %edi,%edi 30: 89 de mov %ebx,%esi 32: e8 b0 29 24 00 call 0x2429e7 37: 85 db test %ebx,%ebx 39: 0f .byte 0xf 3a: 84 2f test %ch,(%rdi) 3c: 01 .byte 0x1