8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 18704 Comm: syz.9.3240 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 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 : [<81441040>] lr : [<8144102c>] psr: 60000013 sp : dfa51cb8 ip : dfa51cb8 fp : dfa51cd4 r10: 00000000 r9 : 00000084 r8 : dfa51da4 r7 : 00004f27 r6 : 0000009b r5 : 8301acc0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8301acc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 868c4800 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8301acc0 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:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8301acc0 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xdfa50000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.9.3240 (pid: 18704, stack limit = 0xdfa50000) Stack: (0xdfa51cb8 to 0xdfa52000) 1ca0: 81440fe0 00004f27 1cc0: 8301acc0 00004f27 dfa51cf4 dfa51cd8 81440d1c 81440fec 00004f27 b5403587 1ce0: 853c7000 853c7000 dfa51d14 dfa51cf8 814410d4 81440cd0 8301acc0 00000000 1d00: 853c7000 00004f27 dfa51d54 dfa51d18 81441284 81441058 dfa51d6c 830f7700 1d20: 82821800 00000000 00000000 829d6f04 8301acc0 00000000 dfa51d90 8301acc0 1d40: 00000000 82b2f06c dfa51d8c dfa51d58 8142fbcc 8144121c 40946400 00000000 1d60: dfa51d7c 200000c0 8301acc0 b5403587 40946400 00000003 00000003 83e16200 1d80: dfa51e4c dfa51d90 8142b3d8 8142facc 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00400005 00000009 00000001 00000cc7 00000fff 1dc0: 5c952799 fffffffa 00000001 00000802 00001602 00007fff 00000000 00000009 1de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 00000000 1e00: 00000006 00000001 00000007 0001003c 0000ad79 00000007 08000000 00000005 1e20: 00000000 514b00b5 00000000 8612d240 8301acc0 200000c0 40946400 00000003 1e40: dfa51f14 dfa51e50 8142c6fc 8142b310 dfa51e4c 514b00b5 00000000 00000000 1e60: 824b957c dfa51ea4 0000005f 84229408 00000064 8301acf0 dfa51ee4 dfa51e88 1e80: 807cf448 807c5820 00000064 00000001 00000000 dfa51ea4 83872850 83418330 1ea0: 00006400 0000000b dfa51e98 00000000 dfa51d38 514b00b5 00000000 8612d240 1ec0: 40946400 200000c0 200000c0 8612d240 00000003 83e16200 dfa51ef4 dfa51ee8 1ee0: 807cf578 514b00b5 dfa51f14 00000000 8612d241 40946400 200000c0 8612d240 1f00: 00000003 83e16200 dfa51fa4 dfa51f18 805908e4 8142c3b4 ecac8b10 83e16200 1f20: dfa51f3c dfa51f30 81ae5274 81ae5140 dfa51f54 dfa51f40 8025a87c 8028c380 1f40: dfa51fb0 40000000 dfa51f84 dfa51f58 80220bf8 8025a838 00000000 8281d2fc 1f60: dfa51fb0 0013e480 ecac8b10 80220b4c 00000000 514b00b5 dfa51fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83e16200 00000036 00000000 dfa51fa8 1fa0: 80200060 805906ac 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff20dc 1fe0: 76ff1e88 76ff1e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81440fe0>] (subdev_8255_io) from [<81440d1c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8301acc0 r5:00004f27 r4:81440fe0 [<81440cc4>] (subdev_8255_do_config) from [<814410d4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81440cc4>] (subdev_8255_do_config) from [<814410d4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:853c7000 [<8144104c>] (subdev_8255_io_init) from [<81441284>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8144104c>] (subdev_8255_io_init) from [<81441284>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:853c7000 r5:00000000 r4:8301acc0 [<81441210>] (dev_8255_attach) from [<8142fbcc>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2f06c r9:00000000 r8:8301acc0 r7:dfa51d90 r6:00000000 r5:8301acc0 r4:829d6f04 [<8142fac0>] (comedi_device_attach) from [<8142b3d8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83e16200 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301acc0 r4:200000c0 [<8142b304>] (do_devconfig_ioctl) from [<8142c6fc>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8301acc0 r4:8612d240 [<8142c3a8>] (comedi_unlocked_ioctl) from [<805908e4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142c3a8>] (comedi_unlocked_ioctl) from [<805908e4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142c3a8>] (comedi_unlocked_ioctl) from [<805908e4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142c3a8>] (comedi_unlocked_ioctl) from [<805908e4>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e16200 r9:00000003 r8:8612d240 r7:200000c0 r6:40946400 r5:8612d241 r4:00000000 [<805906a0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa51fa8 to 0xdfa51ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff20dc 1fe0: 76ff1e88 76ff1e78 00018ba0 001302e0 r10:00000036 r9:83e16200 r8:8020029c r7:00000036 r6:00346310 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