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: 7222 Comm: syz.0.979 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<8144df14>] lr : [<8144df04>] psr: 60000013 sp : dfbd5d30 ip : dfbd5d30 fp : dfbd5d54 r10: 82d2bdc4 r9 : 00000003 r8 : 84138180 r7 : dfbd5d90 r6 : 84138180 r5 : 00000000 r4 : 00000000 r3 : fee00d00 r2 : 81e27468 r1 : 00000001 r0 : 8144db74 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 860d1ac0 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 84138180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfbd4000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 84138180 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 0xdfbd4000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfbd4000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Process syz.0.979 (pid: 7222, stack limit = 0xdfbd4000) Stack: (0xdfbd5d30 to 0xdfbd6000) 5d20: 824ba914 84138180 00000000 82bd27a0 5d40: 81e27928 00000000 dfbd5d8c dfbd5d58 81449a74 8144dd9c 40946400 00000000 5d60: dfbd5d7c 20000180 84138180 b5403587 40946400 00000003 00000003 8511b100 5d80: dfbd5e4c dfbd5d90 81445280 81449978 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000d00 0000001f 00000006 00000000 00000003 00000cc7 00000000 5dc0: 00000007 00000005 000100ff 00000002 00000001 00000001 00000002 00000009 5de0: 00000009 0bc761c6 00000009 00000042 40000003 00000fff 00000008 00000005 5e00: 00000008 0000800b 00000001 00000005 00000002 0000000d 00000001 ffffff5c 5e20: 00000000 5155bdaf 00000000 92fdc280 84138180 20000180 40946400 00000003 5e40: dfbd5f14 dfbd5e50 814465a4 814451b8 00000000 5155bdaf 00000000 00000000 5e60: 8252f804 dfbd5ea4 0000005f 8428bdd8 00000064 841381b0 dfbd5ee4 dfbd5e88 5e80: 807df0b0 807d53c4 00000064 00000001 00000000 dfbd5ea4 8383da90 83418aa0 5ea0: 00006400 0000000b dfbd5e98 00000000 00000000 5155bdaf 00000000 92fdc280 5ec0: 40946400 20000180 20000180 92fdc280 00000003 8511b100 dfbd5ef4 dfbd5ee8 5ee0: 807df1e4 5155bdaf dfbd5f14 00000000 92fdc281 40946400 20000180 92fdc280 5f00: 00000003 8511b100 dfbd5fa4 dfbd5f18 8059c1ac 8144625c ecac8b10 8511b100 5f20: dfbd5f3c dfbd5f30 81b07554 81b07420 dfbd5f54 dfbd5f40 8025a49c 8028c280 5f40: dfbd5fb0 40000000 dfbd5f84 dfbd5f58 80220be0 8025a458 00000000 82a1c2fc 5f60: dfbd5fb0 0013e940 ecac8b10 80220b34 00000000 5155bdaf dfbd5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 8511b100 00000036 00000000 dfbd5fa8 5fa0: 80200060 8059bf74 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fd10dc 5fe0: 76fd0e88 76fd0e78 00018e58 001307a0 60000010 00000003 00000000 00000000 Call trace: [<8144dd90>] (parport_attach) from [<81449a74>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27928 r4:82bd27a0 [<8144996c>] (comedi_device_attach) from [<81445280>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:8511b100 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84138180 r4:20000180 [<814451ac>] (do_devconfig_ioctl) from [<814465a4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:84138180 r4:92fdc280 [<81446250>] (comedi_unlocked_ioctl) from [<8059c1ac>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81446250>] (comedi_unlocked_ioctl) from [<8059c1ac>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81446250>] (comedi_unlocked_ioctl) from [<8059c1ac>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81446250>] (comedi_unlocked_ioctl) from [<8059c1ac>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8511b100 r9:00000003 r8:92fdc280 r7:20000180 r6:40946400 r5:92fdc281 r4:00000000 [<8059bf68>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbd5fa8 to 0xdfbd5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fd10dc 5fe0: 76fd0e88 76fd0e78 00018e58 001307a0 r10:00000036 r9:8511b100 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