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: 1 UID: 0 PID: 23127 Comm: syz.5.4598 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 : [<8145a0ac>] lr : [<8145a09c>] psr: 60000113 sp : dfa8dd30 ip : dfa8dd30 fp : dfa8dd54 r10: 82d2cdd4 r9 : 00000003 r8 : 8301ab40 r7 : dfa8dd90 r6 : 8301ab40 r5 : 00000000 r4 : 00000000 r3 : fee00d00 r2 : 81e277a8 r1 : 00000001 r0 : 81459d0c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 87898f00 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 8301ab40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa8c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8301ab40 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 0xdfa8c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfa8c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.5.4598 (pid: 23127, stack limit = 0xdfa8c000) Stack: (0xdfa8dd30 to 0xdfa8e000) dd20: 824bd160 8301ab40 00000000 82bd2c7c dd40: 81e27c68 00000000 dfa8dd8c dfa8dd58 81455c0c 81459f34 40946400 00000000 dd60: dfa8dd7c 20000180 8301ab40 b5403587 40946400 00000003 00000003 87996400 dd80: dfa8de4c dfa8dd90 81451418 81455b10 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000d00 0000001f 00000006 00000fff 00000003 00000cc7 00000000 ddc0: 00000006 00000005 000100ff 00000002 00000001 00000001 00000002 00000009 dde0: 00000003 00000006 00000009 00000042 40000003 00000fff 00000008 00000007 de00: 02000006 0000800b 00000032 00000005 00000002 0000000d 00000001 ffffff5c de20: 00000000 8a6787c5 00000000 83336480 8301ab40 20000180 40946400 00000003 de40: dfa8df14 dfa8de50 8145273c 81451350 00000000 8a6787c5 00000000 00000000 de60: 82531804 dfa8dea4 0000005f 848b0b68 00000064 8301ab70 dfa8dee4 dfa8de88 de80: 807ea3b4 807e06c8 00000064 00000001 00000000 dfa8dea4 83365010 83441330 dea0: 00006400 0000000b dfa8de98 00000000 00000000 8a6787c5 00000000 83336480 dec0: 40946400 20000180 20000180 83336480 00000003 87996400 dfa8def4 dfa8dee8 dee0: 807ea4e8 8a6787c5 dfa8df14 00000000 83336481 40946400 20000180 83336480 df00: 00000003 87996400 dfa8dfa4 dfa8df18 805a1cfc 814523f4 ecac8b10 87996400 df20: dfa8df3c dfa8df30 81b189d4 81b188a0 dfa8df54 dfa8df40 8025a6bc 8028e2a4 df40: dfa8dfb0 40000000 dfa8df84 dfa8df58 80220be0 8025a678 00000000 82a1c63c df60: dfa8dfb0 0013e9b0 ecac8b10 80220b34 00000000 8a6787c5 dfa8dfac 00000000 df80: 00000000 00346310 00000036 8020029c 87996400 00000036 00000000 dfa8dfa8 dfa0: 80200060 805a1ac4 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f980dc dfe0: 76f97e88 76f97e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81459f28>] (parport_attach) from [<81455c0c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27c68 r4:82bd2c7c [<81455b04>] (comedi_device_attach) from [<81451418>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:87996400 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301ab40 r4:20000180 [<81451344>] (do_devconfig_ioctl) from [<8145273c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8301ab40 r4:83336480 [<814523e8>] (comedi_unlocked_ioctl) from [<805a1cfc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814523e8>] (comedi_unlocked_ioctl) from [<805a1cfc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814523e8>] (comedi_unlocked_ioctl) from [<805a1cfc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814523e8>] (comedi_unlocked_ioctl) from [<805a1cfc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:87996400 r9:00000003 r8:83336480 r7:20000180 r6:40946400 r5:83336481 r4:00000000 [<805a1ab8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa8dfa8 to 0xdfa8dff0) dfa0: 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f980dc dfe0: 76f97e88 76f97e78 00018ebc 00130810 r10:00000036 r9:87996400 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