genirq: Flags mismatch irq 32. 00200001 (comedi_parport) vs. 00200081 (virtio1) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00f24 when write [fee00f24] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5396 Comm: syz.2.365 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 : [<8144ddac>] lr : [<8144dd9c>] psr: 60000013 sp : dfb15d30 ip : dfb15d30 fp : dfb15d54 r10: 82d2bdc4 r9 : 00000003 r8 : 846f3000 r7 : dfb15d90 r6 : 846f3000 r5 : 00000000 r4 : 00000000 r3 : fee00f24 r2 : 81e27468 r1 : 00000001 r0 : 8144da0c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 851b2c80 DAC: 00000000 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 846f3000 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb14000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 846f3000 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 0xdfb14000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfb14000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Process syz.2.365 (pid: 5396, stack limit = 0xdfb14000) Stack: (0xdfb15d30 to 0xdfb16000) 5d20: 824ba918 846f3000 00000000 82bd27a0 5d40: 81e27928 00000000 dfb15d8c dfb15d58 8144990c 8144dc34 40946400 00000000 5d60: dfb15d7c 200000c0 846f3000 b5403587 40946400 00000003 00000003 83f88c40 5d80: dfb15e4c dfb15d90 81445118 81449810 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000f24 00000020 00000004 00000004 00000005 00000002 00000006 5dc0: 00000006 00000005 00000100 00000002 00000080 00000001 00000008 0000001e 5de0: 00000001 00000000 0001a449 00080003 0000041e 0000007f 000000c0 00000200 5e00: 0000ffff 00000009 00000003 0000003c 00000008 00000002 00000000 00000005 5e20: 00000000 2652b0bf 00000000 8333a200 846f3000 200000c0 40946400 00000003 5e40: dfb15f14 dfb15e50 8144643c 81445050 00000000 2652b0bf 00000000 00000000 5e60: 8252f804 dfb15ea4 0000005f 849a05e0 00000064 846f3030 dfb15ee4 dfb15e88 5e80: 807df020 807d5334 00000064 00000001 00000000 dfb15ea4 83363e50 834f4770 5ea0: 00006400 0000000b dfb15e98 00000000 00000000 2652b0bf 00000000 8333a200 5ec0: 40946400 200000c0 200000c0 8333a200 00000003 83f88c40 dfb15ef4 dfb15ee8 5ee0: 807df154 2652b0bf dfb15f14 00000000 8333a201 40946400 200000c0 8333a200 5f00: 00000003 83f88c40 dfb15fa4 dfb15f18 8059c11c 814460f4 ecac8b10 83f88c40 5f20: dfb15f3c dfb15f30 81b073f4 81b072c0 dfb15f54 dfb15f40 8025a49c 8028c27c 5f40: dfb15fb0 40000000 dfb15f84 dfb15f58 80220be0 8025a458 00000000 82a1c2fc 5f60: dfb15fb0 0013e940 ecac8b10 80220b34 00000000 2652b0bf dfb15fac 00000000 5f80: 00000000 00346310 00000036 8020029c 83f88c40 00000036 00000000 dfb15fa8 5fa0: 80200060 8059bee4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f4b0dc 5fe0: 76f4ae88 76f4ae78 00018e58 001307a0 60000010 00000003 00000000 00000000 Call trace: [<8144dc28>] (parport_attach) from [<8144990c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27928 r4:82bd27a0 [<81449804>] (comedi_device_attach) from [<81445118>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83f88c40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:846f3000 r4:200000c0 [<81445044>] (do_devconfig_ioctl) from [<8144643c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:846f3000 r4:8333a200 [<814460e8>] (comedi_unlocked_ioctl) from [<8059c11c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814460e8>] (comedi_unlocked_ioctl) from [<8059c11c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814460e8>] (comedi_unlocked_ioctl) from [<8059c11c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814460e8>] (comedi_unlocked_ioctl) from [<8059c11c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83f88c40 r9:00000003 r8:8333a200 r7:200000c0 r6:40946400 r5:8333a201 r4:00000000 [<8059bed8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb15fa8 to 0xdfb15ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f4b0dc 5fe0: 76f4ae88 76f4ae78 00018e58 001307a0 r10:00000036 r9:83f88c40 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