8<--- cut here --- Unable to handle kernel paging request at virtual address fee00001 when write [fee00001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 3898 Comm: syz.0.21 Not tainted 6.16.0-rc5-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 : [<81397d30>] lr : [<81397d20>] psr: 60000013 sp : dfa59d38 ip : dfa59d38 fp : dfa59d5c r10: 82b15078 r9 : 00000003 r8 : 8408a900 r7 : dfa59d98 r6 : 8408a900 r5 : 00000000 r4 : 00000000 r3 : fee00001 r2 : 81e14f0c r1 : 00000001 r0 : 813979a0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84969f00 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 8408a900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa58000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 8408a900 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 0xdfa58000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfa58000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.21 (pid: 3898, stack limit = 0xdfa58000) Stack: (0xdfa59d38 to 0xdfa5a000) 9d20: 823f8a00 8408a900 9d40: 829c4c58 829c4c58 81e153cc 00000000 dfa59d94 dfa59d60 81393de8 81397bc8 9d60: 20000140 00000000 8330b000 20000140 8408a900 b5403587 20000140 8330b000 9d80: 40946400 00000002 dfa59e4c dfa59d98 8138fa78 81393cf0 656d6f63 705f6964 9da0: 6f707261 00007472 00000000 00000001 00000005 00000000 00000002 000088d7 9dc0: 0000008f 00001007 00000010 00001002 ffffffff 00000200 00000007 10000009 9de0: 00000001 00000005 00000001 00000008 00000003 00000009 0000000e 00000108 9e00: 00000003 00000007 0000100a 00000005 00000001 0000b0c4 0000000c 00000008 9e20: 00400002 00000002 00000000 b340e095 dfa59eac 8485fcc0 8408a900 20000140 9e40: dfa59f14 dfa59e50 81390a2c 8138f9ac 00000000 00000001 81a30fb4 00000000 9e60: 84ab8bc0 8280c960 00000000 00000004 81c01ab8 8408a930 00000002 b340e095 9e80: 80295ac4 00000000 8330b000 ffffffff dfa59efc 80200be4 8330b000 8330b000 9ea0: dfa59ec4 dfa59eb0 81a30fc0 80293598 8056e4a8 90000013 dfa59fa4 dfa59ec8 9ec0: 80200c04 81a30f80 00000000 40946400 80811501 83fe6e58 40946400 00000000 9ee0: 8485fcc1 b340e095 00000003 40946400 00000000 8485fcc1 20000140 00000003 9f00: 8485fcc0 8330b000 dfa59fa4 dfa59f18 8056e2cc 8139045c ecac8b10 8330b000 9f20: dfa59f3c dfa59f30 81a2d0a8 81a2cf78 dfa59f54 dfa59f40 80261ffc 80293598 9f40: dfa59fb0 40000000 dfa59f84 dfa59f58 802229ec 80261fb8 00000000 8281d09c 9f60: dfa59fb0 0014c4a0 ecac8b10 80222940 00000000 b340e095 dfa59fac 00000000 9f80: 00000000 002f6300 00000036 8020029c 8330b000 00000036 00000000 dfa59fa8 9fa0: 80200060 8056e1a8 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b2c0bc 9fe0: 76b2bec0 76b2beb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<81397bbc>] (parport_attach) from [<81393de8>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r6:00000000 r5:81e153cc r4:829c4c58 [<81393ce4>] (comedi_device_attach) from [<8138fa78>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000002 r9:40946400 r8:8330b000 r7:20000140 r6:b5403587 r5:8408a900 r4:20000140 [<8138f9a0>] (do_devconfig_ioctl) from [<81390a2c>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:8408a900 r4:8485fcc0 [<81390450>] (comedi_unlocked_ioctl) from [<8056e2cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390450>] (comedi_unlocked_ioctl) from [<8056e2cc>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390450>] (comedi_unlocked_ioctl) from [<8056e2cc>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390450>] (comedi_unlocked_ioctl) from [<8056e2cc>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:8330b000 r9:8485fcc0 r8:00000003 r7:20000140 r6:8485fcc1 r5:00000000 r4:40946400 [<8056e19c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa59fa8 to 0xdfa59ff0) 9fa0: 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b2c0bc 9fe0: 76b2bec0 76b2beb0 000193a4 00131f40 r10:00000036 r9:8330b000 r8:8020029c r7:00000036 r6:002f6300 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