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: 12262 Comm: syz.1.2147 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: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 : [<8143459c>] lr : [<8143458c>] psr: 60000113 sp : dfa2dd30 ip : dfa2dd30 fp : dfa2dd54 r10: 82b2f06c r9 : 00000003 r8 : 8301ff00 r7 : dfa2dd90 r6 : 8301ff00 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e24b58 r1 : 00000001 r0 : 8143420c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 89734780 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 8301ff00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa2c000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r8 information: slab kmalloc-192 start 8301ff00 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 0xdfa2c000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xdfa2c000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.1.2147 (pid: 12262, stack limit = 0xdfa2c000) Stack: (0xdfa2dd30 to 0xdfa2e000) dd20: 82444e48 8301ff00 829d675c 829d675c dd40: 81e25018 00000000 dfa2dd8c dfa2dd58 81430114 81434434 40946400 00000000 dd60: dfa2dd7c 200000c0 8301ff00 b5403587 40946400 00000003 00000003 83e155c0 dd80: dfa2de4c dfa2dd90 8142b920 81430014 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 0000001f 00010000 000000ff 00000005 00000cc7 00000008 ddc0: 00000007 0000000a 00000100 00000002 ffffffff 00000001 00000009 00000003 dde0: 00000002 00000000 00020007 00000003 40000003 40000089 00000006 00000004 de00: 20001e58 0000000b 00000001 0000007c 00000208 00000006 00000000 0000000e de20: 00000000 c2af5045 00000000 8337a240 8301ff00 200000c0 40946400 00000003 de40: dfa2df14 dfa2de50 8142cc44 8142b858 00000000 c2af5045 dfa2de8c 00000000 de60: 824b957c dfa2dea4 0000005f 84575600 00000064 8301ff30 dfa2dee4 dfa2de88 de80: 807cf7f8 807c5bd0 00000064 00000001 00000000 dfa2dea4 838733d0 834e5908 dea0: 00006400 0000000b dfa2de98 00000000 00000000 c2af5045 8337a240 8337a240 dec0: 40946400 200000c0 200000c0 8337a240 00000003 83e155c0 dfa2def4 dfa2dee8 dee0: 807cf928 c2af5045 dfa2df14 00000000 8337a240 40946400 200000c0 8337a240 df00: 00000003 83e155c0 dfa2dfa4 dfa2df18 80590c2c 8142c8fc ecac8b10 83e155c0 df20: dfa2df3c dfa2df30 81ae5c34 81ae5b00 dfa2df54 dfa2df40 8025a87c 8028c380 df40: dfa2dfb0 40000000 dfa2df84 dfa2df58 80220bf8 8025a838 00000000 8281d2fc df60: dfa2dfb0 0013e480 ecac8b10 80220b4c 00000000 c2af5045 dfa2dfac 00000000 df80: 00000000 00346310 00000036 8020029c 83e155c0 00000036 00000000 dfa2dfa8 dfa0: 80200060 805909f4 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f910dc dfe0: 76f90e88 76f90e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81434428>] (parport_attach) from [<81430114>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25018 r4:829d675c [<81430008>] (comedi_device_attach) from [<8142b920>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83e155c0 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301ff00 r4:200000c0 [<8142b84c>] (do_devconfig_ioctl) from [<8142cc44>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8301ff00 r4:8337a240 [<8142c8f0>] (comedi_unlocked_ioctl) from [<80590c2c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142c8f0>] (comedi_unlocked_ioctl) from [<80590c2c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142c8f0>] (comedi_unlocked_ioctl) from [<80590c2c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142c8f0>] (comedi_unlocked_ioctl) from [<80590c2c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e155c0 r9:00000003 r8:8337a240 r7:200000c0 r6:40946400 r5:8337a240 r4:00000000 [<805909e8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa2dfa8 to 0xdfa2dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f910dc dfe0: 76f90e88 76f90e78 00018ba0 001302e0 r10:00000036 r9:83e155c0 r8:8020029c r7:00000036 r6:00346310 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