genirq: Flags mismatch irq 35. 00200004 (comedi_parport) vs. 00200084 (kmi-pl050) 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: 0 UID: 0 PID: 13791 Comm: syz.4.2469 Not tainted 6.17.0-rc1-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 : [<813aaec8>] lr : [<813aaeb8>] psr: 60000013 sp : dfccdd30 ip : dfccdd30 fp : dfccdd54 r10: 82b16f00 r9 : 00000003 r8 : 842eb000 r7 : dfccdd90 r6 : 842eb000 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15444 r1 : 00000001 r0 : 813aab38 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85dcc3c0 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:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 842eb000 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfccc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 842eb000 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 0xdfccc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfccc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.4.2469 (pid: 13791, stack limit = 0xdfccc000) Stack: (0xdfccdd30 to 0xdfcce000) dd20: 823fe320 842eb000 dfccdd58 829cf8ec dd40: 81e15904 842eb044 dfccdd8c dfccdd58 813a6f60 813aad60 200000c0 00000000 dd60: dfccdd7c 200000c0 842eb000 b5403587 200000c0 85890000 40946400 00000003 dd80: dfccde4c dfccdd90 813a2ae0 813a6e64 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 00000023 00010000 00000004 00000005 00000cc7 00000008 ddc0: 00000007 0000000a 00000100 00000002 00000001 00000002 00000001 00000006 dde0: 00000101 00000000 0001a449 00000003 40000003 00000089 0000caa7 00000000 de00: 20001e58 0000000b 00000e69 0000003c 00000008 00000006 00000000 fffffff8 de20: 00000000 5183543b 00000000 85dc3cc0 842eb000 200000c0 200000c0 85890000 de40: dfccdf14 dfccde50 813a3aac 813a29ec 00000000 00000000 00000000 5183543b de60: 00000000 00000000 8247054c 0000005f 8427e458 842eb030 842ea054 85890000 de80: dfccdee4 dfccde90 80797824 8078db88 00000064 00000001 00000000 dfccdeac dea0: 8338fa90 834325d8 00006400 0000000b dfccdea0 00000000 00000000 5183543b dec0: 85dc3cc0 40946400 200000c0 200000c0 85dc3cc0 00000003 dfccdef4 dfccdee8 dee0: 80797944 5183543b dfccdf14 40946400 00000000 85dc3cc1 200000c0 85dc3cc0 df00: 00000003 85890000 dfccdfa4 dfccdf18 8056cdf8 813a34dc ecac8b10 85890000 df20: dfccdf3c dfccdf30 81a38778 81a38648 dfccdf54 dfccdf40 8025e490 8028ef8c df40: dfccdfb0 40000000 dfccdf84 dfccdf58 802229ec 8025e44c 00000000 8281cddc df60: dfccdfb0 0014c820 ecac8b10 80222940 00000000 5183543b dfccdfac 00000000 df80: 00000000 002f6308 00000036 8020029c 85890000 00000036 00000000 dfccdfa8 dfa0: 80200060 8056ccd4 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fcd0bc dfe0: 76fccec0 76fcceb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aad54>] (parport_attach) from [<813a6f60>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:842eb044 r5:81e15904 r4:829cf8ec [<813a6e58>] (comedi_device_attach) from [<813a2ae0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85890000 r7:200000c0 r6:b5403587 r5:842eb000 r4:200000c0 [<813a29e0>] (do_devconfig_ioctl) from [<813a3aac>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:85890000 r7:200000c0 r6:200000c0 r5:842eb000 r4:85dc3cc0 [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85890000 r9:00000003 r8:85dc3cc0 r7:200000c0 r6:85dc3cc1 r5:00000000 r4:40946400 [<8056ccc8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfccdfa8 to 0xdfccdff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fcd0bc dfe0: 76fccec0 76fcceb0 0001948c 001322c0 r10:00000036 r9:85890000 r8:8020029c r7:00000036 r6:002f6308 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