8<--- cut here --- Unable to handle kernel paging request at virtual address fee00297 when write [fee00297] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 30178 Comm: syz.5.6595 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:99 [inline] PC is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<8149fca0>] lr : [<8149fc8c>] psr: 60000013 sp : df841cb8 ip : df841cb8 fp : df841cd4 r10: 00000294 r9 : 00000004 r8 : df841da4 r7 : 00000000 r6 : 0000009b r5 : 842a1e40 r4 : 00000297 r3 : 0000009b r2 : fee00297 r1 : 00000001 r0 : 842a1e40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8611ab80 DAC: 00000000 Register r0 information: slab kmalloc-192 start 842a1e40 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 842a1e40 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xdf840000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf840000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdf840000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.5.6595 (pid: 30178, stack limit = 0xdf840000) Stack: (0xdf841cb8 to 0xdf842000) 1ca0: 8149fc40 00000294 1cc0: 842a1e40 00000000 df841cf4 df841cd8 8149f97c 8149fc4c 00000294 80546004 1ce0: 8679c800 8679c800 df841d14 df841cf8 8149fd34 8149f930 842a1e40 00000000 1d00: 8679c800 00000000 df841d54 df841d18 8149fee4 8149fcb8 ffffffff 00000004 1d20: 82a22dc0 00000000 00000000 82bd961c 842a1e40 00000000 df841d90 842a1e40 1d40: 00000000 82d30dfc df841d8c df841d58 8148e888 8149fe7c 40946400 00000000 1d60: df841d7c 20000140 842a1e40 b5403587 40946400 00000000 00000003 86d63d40 1d80: df841e4c df841d90 8148a08c 8148e78c 35353238 00000000 00000000 00000000 1da0: 00000000 00000294 00000008 7fffffff 00000005 00000027 00002006 020000f1 1dc0: 0002000c 00180ffa 00000002 00000000 00000002 00000000 00000005 00000001 1de0: 00007fff ffffffa8 7ffffffd 000001ef 00000004 20000010 00000006 00000008 1e00: 00004008 0000746f 0000009f 00000009 00000004 000000ee 00000007 00008000 1e20: 00000000 2299c74f 00000000 8384b480 842a1e40 20000140 40946400 00000000 1e40: df841f14 df841e50 8148b3b4 81489fcc df841e4c 2299c74f 00000000 00000000 1e60: 8254980c df841ea4 0000005f 84544058 00000064 842a1e70 df841ee4 df841e88 1e80: 80806178 807fc3f4 00000064 00000001 00000000 df841ea4 855c1110 834ee550 1ea0: 00006400 0000000b df841e98 00000000 df841d38 2299c74f 00000000 8384b480 1ec0: 40946400 20000140 20000140 8384b480 00000003 86d63d40 df841ef4 df841ee8 1ee0: 808062ac 2299c74f df841f14 00000000 8384b481 40946400 20000140 8384b480 1f00: 00000003 86d63d40 df841fa4 df841f18 805bab18 8148b06c ecac8b10 86d63d40 1f20: df841f3c df841f30 81b57660 81b5752c df841f54 df841f40 8025a7a8 8028e490 1f40: df841fb0 40000000 df841f84 df841f58 80220bdc 8025a764 00000000 82a1eb0c 1f60: df841fb0 0013e9c0 ecac8b10 80220b30 00000000 2299c74f df841fac 00000000 1f80: 00000000 00356310 00000036 8020029c 86d63d40 00000036 00000000 df841fa8 1fa0: 80200060 805ba8e0 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f900dc 1fe0: 76f8fe88 76f8fe78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8149fc40>] (subdev_8255_io) from [<8149f97c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:842a1e40 r5:00000294 r4:8149fc40 [<8149f924>] (subdev_8255_do_config) from [<8149fd34>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149f924>] (subdev_8255_do_config) from [<8149fd34>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8679c800 [<8149fcac>] (subdev_8255_io_init) from [<8149fee4>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149fcac>] (subdev_8255_io_init) from [<8149fee4>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8679c800 r5:00000000 r4:842a1e40 [<8149fe70>] (dev_8255_attach) from [<8148e888>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:842a1e40 r7:df841d90 r6:00000000 r5:842a1e40 r4:82bd961c [<8148e780>] (comedi_device_attach) from [<8148a08c>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:86d63d40 r9:00000003 r8:00000000 r7:40946400 r6:b5403587 r5:842a1e40 r4:20000140 [<81489fc0>] (do_devconfig_ioctl) from [<8148b3b4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000000 r7:40946400 r6:20000140 r5:842a1e40 r4:8384b480 [<8148b060>] (comedi_unlocked_ioctl) from [<805bab18>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148b060>] (comedi_unlocked_ioctl) from [<805bab18>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148b060>] (comedi_unlocked_ioctl) from [<805bab18>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148b060>] (comedi_unlocked_ioctl) from [<805bab18>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:86d63d40 r9:00000003 r8:8384b480 r7:20000140 r6:40946400 r5:8384b481 r4:00000000 [<805ba8d4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf841fa8 to 0xdf841ff0) 1fa0: 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f900dc 1fe0: 76f8fe88 76f8fe78 00018ebc 00130820 r10:00000036 r9:86d63d40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction