genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00d00 when write [fee00d00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4166 Comm: syz.0.136 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<8145a404>] lr : [<8145a3f4>] psr: 60000013 sp : dfa65d30 ip : dfa65d30 fp : dfa65d54 r10: 82d2cdd4 r9 : 00000003 r8 : 8334cb40 r7 : dfa65d90 r6 : 8334cb40 r5 : 00000000 r4 : 00000000 r3 : fee00d00 r2 : 81e277a8 r1 : 00000001 r0 : 8145a064 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 860c1dc0 DAC: fffffffd Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8334cb40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa64000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r8 information: slab kmalloc-192 start 8334cb40 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfa64000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r12 information: 2-page vmalloc region starting at 0xdfa64000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Process syz.0.136 (pid: 4166, stack limit = 0xdfa64000) Stack: (0xdfa65d30 to 0xdfa66000) 5d20: 824bd1b8 8334cb40 00000000 82bd2c7c 5d40: 81e27c68 00000000 dfa65d8c dfa65d58 81455f64 8145a28c 40946400 00000000 5d60: dfa65d7c 20000180 8334cb40 b5403587 40946400 00000003 00000003 83e0f080 5d80: dfa65e4c dfa65d90 81451770 81455e68 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000d00 0000001f 00000006 00008000 00000003 00000cc7 00000000 5dc0: 00000006 00000005 000100ff 00000002 00000002 00000001 00000002 00000009 5de0: 00000003 0bc761c6 00000009 00000042 40000003 00000fff 00000008 00000005 5e00: 02000006 0000800b 00000032 00000005 00000002 0000000d 00000002 ffffff5c 5e20: 00000000 ea68fd4c 00000000 8605ac00 8334cb40 20000180 40946400 00000003 5e40: dfa65f14 dfa65e50 81452a94 814516a8 00000000 ea68fd4c 00000000 00000000 5e60: 82531804 dfa65ea4 0000005f 841d45e0 00000064 8334cb70 dfa65ee4 dfa65e88 5e80: 807ea7bc 807e0ad0 00000064 00000001 00000000 dfa65ea4 838400d0 834da3b8 5ea0: 00006400 0000000b dfa65e98 00000000 00000000 ea68fd4c 00000000 8605ac00 5ec0: 40946400 20000180 20000180 8605ac00 00000003 83e0f080 dfa65ef4 dfa65ee8 5ee0: 807ea8f0 ea68fd4c dfa65f14 00000000 8605ac01 40946400 20000180 8605ac00 5f00: 00000003 83e0f080 dfa65fa4 dfa65f18 805a2104 8145274c ecac8b10 83e0f080 5f20: dfa65f3c dfa65f30 81b18d74 81b18c40 dfa65f54 dfa65f40 8025a6ac 8028e294 5f40: dfa65fb0 40000000 dfa65f84 dfa65f58 80220be0 8025a668 00000000 82a1c63c 5f60: dfa65fb0 0013e9b0 ecac8b10 80220b34 00000000 ea68fd4c dfa65fac 00000000 5f80: 00000000 00346310 00000036 8020029c 83e0f080 00000036 00000000 dfa65fa8 5fa0: 80200060 805a1ecc 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fae0dc 5fe0: 76fade88 76fade78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<8145a280>] (parport_attach) from [<81455f64>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27c68 r4:82bd2c7c [<81455e5c>] (comedi_device_attach) from [<81451770>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83e0f080 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8334cb40 r4:20000180 [<8145169c>] (do_devconfig_ioctl) from [<81452a94>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8334cb40 r4:8605ac00 [<81452740>] (comedi_unlocked_ioctl) from [<805a2104>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81452740>] (comedi_unlocked_ioctl) from [<805a2104>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81452740>] (comedi_unlocked_ioctl) from [<805a2104>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81452740>] (comedi_unlocked_ioctl) from [<805a2104>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e0f080 r9:00000003 r8:8605ac00 r7:20000180 r6:40946400 r5:8605ac01 r4:00000000 [<805a1ec0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa65fa8 to 0xdfa65ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fae0dc 5fe0: 76fade88 76fade78 00018ebc 00130810 r10:00000036 r9:83e0f080 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction