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: 20363 Comm: syz.2.2955 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 : [<81459bdc>] lr : [<81459bcc>] psr: 60000013 sp : dfa65d30 ip : dfa65d30 fp : dfa65d54 r10: 82d2cdc4 r9 : 00000003 r8 : 8334d840 r7 : dfa65d90 r6 : 8334d840 r5 : 00000000 r4 : 00000000 r3 : fee00d00 r2 : 81e277a8 r1 : 00000001 r0 : 8145983c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85ed4f40 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 8334d840 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa64000 allocated at create_io_thread+0x68/0x94 kernel/fork.c:2659 Register r8 information: slab kmalloc-192 start 8334d840 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 0xdfa64000 allocated at create_io_thread+0x68/0x94 kernel/fork.c:2659 Register r12 information: 2-page vmalloc region starting at 0xdfa64000 allocated at create_io_thread+0x68/0x94 kernel/fork.c:2659 Process syz.2.2955 (pid: 20363, stack limit = 0xdfa64000) Stack: (0xdfa65d30 to 0xdfa66000) 5d20: 824bd074 8334d840 00000000 82bd2c7c 5d40: 81e27c68 00000000 dfa65d8c dfa65d58 81455740 81459a64 40946400 00000000 5d60: dfa65d7c 20000180 8334d840 b5403587 40946400 00000003 00000003 86e1be80 5d80: dfa65e4c dfa65d90 81450f4c 81455644 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000d00 0000001f 00000006 00000fff 00000003 00000cc7 00000000 5dc0: 00000006 00000005 000100ff 00000002 00000001 00000001 00000002 00000009 5de0: 00000003 0bc761c6 00000009 00000042 40000003 00000fff 00000008 00000005 5e00: 02000006 0000800b 00000032 00000005 00000002 0000000d 00000001 ffffff5c 5e20: 00000000 a682a1a2 00000000 867e4f80 8334d840 20000180 40946400 00000003 5e40: dfa65f14 dfa65e50 81452270 81450e84 dfa65e4c a682a1a2 00000000 00000000 5e60: 82531804 dfa65ea4 0000005f 844b6058 00000064 8334d870 dfa65ee4 dfa65e88 5e80: 807ea28c 807e05a0 00000064 00000001 00000000 dfa65ea4 864be0d0 8342d088 5ea0: 00006400 0000000b dfa65e98 00000000 dfa65d38 a682a1a2 00000000 867e4f80 5ec0: 40946400 20000180 20000180 867e4f80 00000003 86e1be80 dfa65ef4 dfa65ee8 5ee0: 807ea3c0 a682a1a2 dfa65f14 00000000 867e4f81 40946400 20000180 867e4f80 5f00: 00000003 86e1be80 dfa65fa4 dfa65f18 805a1c14 81451f28 ecac8b10 86e1be80 5f20: dfa65f3c dfa65f30 81b18494 81b18360 dfa65f54 dfa65f40 8025a6bc 8028e2a4 5f40: dfa65fb0 40000000 dfa65f84 dfa65f58 80220be0 8025a678 00000000 82a1c63c 5f60: dfa65fb0 0013e9b0 ecac8b10 80220b34 00000000 a682a1a2 dfa65fac 00000000 5f80: 00000000 00346310 00000036 8020029c 86e1be80 00000036 00000000 dfa65fa8 5fa0: 80200060 805a19dc 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff70dc 5fe0: 76ff6e88 76ff6e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81459a58>] (parport_attach) from [<81455740>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27c68 r4:82bd2c7c [<81455638>] (comedi_device_attach) from [<81450f4c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:86e1be80 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8334d840 r4:20000180 [<81450e78>] (do_devconfig_ioctl) from [<81452270>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8334d840 r4:867e4f80 [<81451f1c>] (comedi_unlocked_ioctl) from [<805a1c14>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81451f1c>] (comedi_unlocked_ioctl) from [<805a1c14>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81451f1c>] (comedi_unlocked_ioctl) from [<805a1c14>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81451f1c>] (comedi_unlocked_ioctl) from [<805a1c14>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:86e1be80 r9:00000003 r8:867e4f80 r7:20000180 r6:40946400 r5:867e4f81 r4:00000000 [<805a19d0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa65fa8 to 0xdfa65ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff70dc 5fe0: 76ff6e88 76ff6e78 00018ebc 00130810 r10:00000036 r9:86e1be80 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