genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 8237 Comm: syz.1.1201 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:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813cbed0>] lr : [<813cbec0>] psr: 60000113 sp : dfa7dd30 ip : dfa7dd30 fp : dfa7dd54 r10: 82b23f28 r9 : 00000003 r8 : 840dc600 r7 : dfa7dd90 r6 : 840dc600 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1793c r1 : 00000001 r0 : 813cbb40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 859e97c0 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:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 840dc600 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa7c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 840dc600 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 0xdfa7c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfa7c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.1201 (pid: 8237, stack limit = 0xdfa7c000) Stack: (0xdfa7dd30 to 0xdfa7e000) dd20: 82402ca4 840dc600 829d1b2c 829d1b2c dd40: 81e17dfc 840dc644 dfa7dd8c dfa7dd58 813c7f60 813cbd68 200000c0 00000000 dd60: dfa7dd7c 200000c0 840dc600 b5403587 200000c0 8330d400 40946400 00000003 dd80: dfa7de4c dfa7dd90 813c3aac 813c7e64 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 0000001f 00000101 00000004 00000003 00000cc7 00000004 ddc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000006 dde0: 10000105 00000000 00000007 00000003 3fff7fff 00000089 00000010 00000001 de00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 00000002 effffff8 de20: 00000000 df24723b 00000000 84732d80 840dc600 200000c0 200000c0 8330d400 de40: dfa7df14 dfa7de50 813c4a78 813c39b8 00000000 00000000 00000000 df24723b de60: 00000000 00000000 824755b4 0000005f 83bfb7f8 840dc630 84100dd4 8330d400 de80: dfa7dee4 dfa7de90 807a999c 8079fd94 00000064 00000001 00000000 dfa7deac dea0: 859a2e50 834cc6e8 00006400 0000000b dfa7dea0 00000000 00000000 df24723b dec0: 84732d80 40946400 200000c0 200000c0 84732d80 00000003 dfa7def4 dfa7dee8 dee0: 807a9abc df24723b dfa7df14 40946400 00000000 84732d81 200000c0 84732d80 df00: 00000003 8330d400 dfa7dfa4 dfa7df18 8057b7e8 813c44a8 ecac8b10 8330d400 df20: dfa7df3c dfa7df30 81a42bf8 81a42ac8 dfa7df54 dfa7df40 8025c478 8028d90c df40: dfa7dfb0 40000000 dfa7df84 dfa7df58 802229ec 8025c434 00000000 8281ccf4 df60: dfa7dfb0 0014ca70 ecac8b10 80222940 00000000 df24723b dfa7dfac 00000000 df80: 00000000 00316308 00000036 8020029c 8330d400 00000036 00000000 dfa7dfa8 dfa0: 80200060 8057b6c4 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ffb0bc dfe0: 76ffaec0 76ffaeb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813cbd5c>] (parport_attach) from [<813c7f60>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840dc644 r5:81e17dfc r4:829d1b2c [<813c7e58>] (comedi_device_attach) from [<813c3aac>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8330d400 r7:200000c0 r6:b5403587 r5:840dc600 r4:200000c0 [<813c39ac>] (do_devconfig_ioctl) from [<813c4a78>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8330d400 r7:200000c0 r6:200000c0 r5:840dc600 r4:84732d80 [<813c449c>] (comedi_unlocked_ioctl) from [<8057b7e8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c449c>] (comedi_unlocked_ioctl) from [<8057b7e8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c449c>] (comedi_unlocked_ioctl) from [<8057b7e8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c449c>] (comedi_unlocked_ioctl) from [<8057b7e8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8330d400 r9:00000003 r8:84732d80 r7:200000c0 r6:84732d81 r5:00000000 r4:40946400 [<8057b6b8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa7dfa8 to 0xdfa7dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ffb0bc dfe0: 76ffaec0 76ffaeb0 000195a4 00132510 r10:00000036 r9:8330d400 r8:8020029c r7:00000036 r6:00316308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 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