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: 5596 Comm: syz.1.536 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 : [<8145a1ec>] lr : [<8145a1dc>] psr: 600f0013 sp : dfa51d30 ip : dfa51d30 fp : dfa51d54 r10: 82d2cdd4 r9 : 00000003 r8 : 845d86c0 r7 : dfa51d90 r6 : 845d86c0 r5 : 00000000 r4 : 00000000 r3 : fee00d00 r2 : 81e277a8 r1 : 00000001 r0 : 81459e4c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86379dc0 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 845d86c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 845d86c0 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 0xdfa50000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.1.536 (pid: 5596, stack limit = 0xdfa50000) Stack: (0xdfa51d30 to 0xdfa52000) 1d20: 824bd1ac 845d86c0 00000000 82bd2c7c 1d40: 81e27c68 00000000 dfa51d8c dfa51d58 81455d4c 8145a074 40946400 00000000 1d60: dfa51d7c 20000180 845d86c0 b5403587 40946400 00000003 00000003 83fa4b00 1d80: dfa51e4c dfa51d90 81451558 81455c50 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000d00 0000001f 00000006 00000fff 00000003 00000cc7 00000000 1dc0: 00000006 00000005 000100ff 00000002 00000001 00000001 00000002 00000009 1de0: 00000003 0bc761c6 00000009 00000042 40000003 00000fff 00000008 00000005 1e00: 02000006 0000800b 00000032 00000005 00000002 0000000d 00000001 ffffff5c 1e20: 00000000 bf811523 00000000 86198e80 845d86c0 20000180 40946400 00000003 1e40: dfa51f14 dfa51e50 8145287c 81451490 00000000 bf811523 00000000 00000000 1e60: 82531804 dfa51ea4 0000005f 84374408 00000064 845d86f0 dfa51ee4 dfa51e88 1e80: 807ea514 807e0828 00000064 00000001 00000000 dfa51ea4 830e8d90 834d43b8 1ea0: 00006400 0000000b dfa51e98 00000000 00000000 bf811523 00000000 86198e80 1ec0: 40946400 20000180 20000180 86198e80 00000003 83fa4b00 dfa51ef4 dfa51ee8 1ee0: 807ea648 bf811523 dfa51f14 00000000 86198e81 40946400 20000180 86198e80 1f00: 00000003 83fa4b00 dfa51fa4 dfa51f18 805a1e5c 81452534 ecac8b10 83fa4b00 1f20: dfa51f3c dfa51f30 81b18b14 81b189e0 dfa51f54 dfa51f40 8025a6bc 8028e2a4 1f40: dfa51fb0 40000000 dfa51f84 dfa51f58 80220be0 8025a678 00000000 82a1c63c 1f60: dfa51fb0 0013e9b0 ecac8b10 80220b34 00000000 bf811523 dfa51fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83fa4b00 00000036 00000000 dfa51fa8 1fa0: 80200060 805a1c24 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f160dc 1fe0: 76f15e88 76f15e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<8145a068>] (parport_attach) from [<81455d4c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27c68 r4:82bd2c7c [<81455c44>] (comedi_device_attach) from [<81451558>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83fa4b00 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:845d86c0 r4:20000180 [<81451484>] (do_devconfig_ioctl) from [<8145287c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:845d86c0 r4:86198e80 [<81452528>] (comedi_unlocked_ioctl) from [<805a1e5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81452528>] (comedi_unlocked_ioctl) from [<805a1e5c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81452528>] (comedi_unlocked_ioctl) from [<805a1e5c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81452528>] (comedi_unlocked_ioctl) from [<805a1e5c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83fa4b00 r9:00000003 r8:86198e80 r7:20000180 r6:40946400 r5:86198e81 r4:00000000 [<805a1c18>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa51fa8 to 0xdfa51ff0) 1fa0: 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f160dc 1fe0: 76f15e88 76f15e78 00018ebc 00130810 r10:00000036 r9:83fa4b00 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