Hello, When fuzzing the Linux kernel driver v6.0-rc4, the following crash was triggered. HEAD commit: 7e18e42e4b280c85b76967a9106a13ca61c16179 git tree: upstream kernel config: https://pastebin.com/raw/xtrgsXP3 console output: https://pastebin.com/raw/T6bLnbiJ Sorry I dont have any C reproducer on this bug, however, I would appreciate it if you have any idea how to solve this bug. The crash report is as follows: BUG: unable to handle page fault for address: ffffed104565bc78 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 7ffd0067 P4D 7ffd0067 PUD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 12256 Comm: usb-storage Not tainted 6.0.0-rc4+ #20 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0xe0/0x190 mm/kasan/generic.c:189 Code: 80 38 00 74 ee 49 89 c0 b8 01 00 00 00 4d 85 c0 75 57 5b 5d 41 5c c3 4d 85 c9 74 71 49 01 d9 eb 09 48 83 c0 01 4c 39 c8 74 63 <80> 38 00 74 f2 eb d4 41 bc 08 00 00 00 45 29 c4 49 89 d8 4d 8d 0c RSP: 0018:ffffc90018cbfd30 EFLAGS: 00010282 RAX: ffffed104565bc78 RBX: ffffed104565bc78 RCX: ffffffff84ab8eaa RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88822b2de3c0 RBP: ffffed104565bc79 R08: ffffffff84ab8e81 R09: ffffed104565bc79 R10: ffff88822b2de3c7 R11: ffffed104565bc78 R12: 000000000000003f R13: ffff88806620b120 R14: 00000000ffffffff R15: ffff88806620b1f4 FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffed104565bc78 CR3: 0000000056ea7000 CR4: 0000000000350ef0 Call Trace: <TASK> instrument_atomic_write include/linux/instrumented.h:86 [inline] set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline] sbitmap_deferred_clear_bit include/linux/sbitmap.h:327 [inline] sbitmap_put include/linux/sbitmap.h:336 [inline] scsi_device_unbusy+0x1aa/0x380 drivers/scsi/scsi_lib.c:301 scsi_finish_command+0x86/0x530 drivers/scsi/scsi.c:166 scsi_complete+0x126/0x260 drivers/scsi/scsi_lib.c:1438 blk_mq_complete_request_direct include/linux/blk-mq.h:814 [inline] scsi_done_internal+0x1de/0x490 drivers/scsi/scsi_lib.c:1627 usb_stor_control_thread+0x72c/0x960 drivers/usb/storage/usb.c:420 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> Modules linked in: CR2: ffffed104565bc78 ---[ end trace 0000000000000000 ]--- RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0xe0/0x190 mm/kasan/generic.c:189 Code: 80 38 00 74 ee 49 89 c0 b8 01 00 00 00 4d 85 c0 75 57 5b 5d 41 5c c3 4d 85 c9 74 71 49 01 d9 eb 09 48 83 c0 01 4c 39 c8 74 63 <80> 38 00 74 f2 eb d4 41 bc 08 00 00 00 45 29 c4 49 89 d8 4d 8d 0c RSP: 0018:ffffc90018cbfd30 EFLAGS: 00010282 RAX: ffffed104565bc78 RBX: ffffed104565bc78 RCX: ffffffff84ab8eaa RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88822b2de3c0 RBP: ffffed104565bc79 R08: ffffffff84ab8e81 R09: ffffed104565bc79 R10: ffff88822b2de3c7 R11: ffffed104565bc78 R12: 000000000000003f R13: ffff88806620b120 R14: 00000000ffffffff R15: ffff88806620b1f4 FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffed104565bc78 CR3: 0000000056ea7000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 80 38 00 cmpb $0x0,(%rax) 3: 74 ee je 0xfffffff3 5: 49 89 c0 mov %rax,%r8 8: b8 01 00 00 00 mov $0x1,%eax d: 4d 85 c0 test %r8,%r8 10: 75 57 jne 0x69 12: 5b pop %rbx 13: 5d pop %rbp 14: 41 5c pop %r12 16: c3 retq 17: 4d 85 c9 test %r9,%r9 1a: 74 71 je 0x8d 1c: 49 01 d9 add %rbx,%r9 1f: eb 09 jmp 0x2a 21: 48 83 c0 01 add $0x1,%rax 25: 4c 39 c8 cmp %r9,%rax 28: 74 63 je 0x8d * 2a: 80 38 00 cmpb $0x0,(%rax) <-- trapping instruction 2d: 74 f2 je 0x21 2f: eb d4 jmp 0x5 31: 41 bc 08 00 00 00 mov $0x8,%r12d 37: 45 29 c4 sub %r8d,%r12d 3a: 49 89 d8 mov %rbx,%r8 3d: 4d rex.WRB 3e: 8d .byte 0x8d 3f: 0c .byte 0xc
