8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85b50003, *pmd=df22f003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5717 Comm: syz.1.538 Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at io_ring_buffers_peek+0x24/0x258 io_uring/kbuf.c:227 LR is at io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343 pc : [<808896c0>] lr : [<80889e04>] psr: 20000013 sp : dfb79d90 ip : dfb79dd8 fp : dfb79dd4 r10: 00000362 r9 : 00000000 r8 : 85b43b40 r7 : 85481a0c r6 : 85481a00 r5 : dfb79e14 r4 : 858f0000 r3 : 00000001 r2 : 85481a0c r1 : dfb79e14 r0 : 858f0000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85582880 DAC: 00000000 Register r0 information: slab io_kiocb start 858f0000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfb78000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85481a00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 858f0000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfb78000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 85481a00 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 85481a00 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 85b43b40 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfb78000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfb78000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.1.538 (pid: 5717, stack limit = 0xdfb78000) Stack: (0xdfb79d90 to 0xdfb7a000) 9d80: 81a4c394 8030cb14 84430100 00000001 9da0: 00010000 85481a0c 00000000 858f0000 dfb79e14 85481a00 85481a0c 00000000 9dc0: 80000001 00000362 dfb79dec dfb79dd8 80889e04 808896a8 83562500 858f0000 9de0: dfb79e54 dfb79df0 80893334 80889da8 00000000 dfb79dd8 85481a00 e621fe64 9e00: 00010001 00000001 84430128 00000000 00000000 85481a0c 00000000 00000000 9e20: 00010001 e621fe64 dfb79e54 858f0000 81cf0ca0 00000000 00000000 00000000 9e40: 80000001 84520000 dfb79e7c dfb79e58 80882314 8089308c 858f0000 80000001 9e60: 0000001b 81cf0b5c 85587600 00000000 dfb79ebc dfb79e80 80886de4 808822d4 9e80: 858f0240 858f0300 858f03c0 81cf0ca0 858f0540 84430000 858f006c 858f0000 9ea0: 85780000 00000000 00000000 84520000 dfb79f14 dfb79ec0 808878fc 80886da8 9ec0: 8088e2b8 81a4c338 dfb79f24 dfb79ed8 00000800 00000800 81cf0b5c 00000800 9ee0: 84430000 e621fe64 85587540 00000000 84430000 00003516 85587540 00000000 9f00: 84520000 00000000 dfb79fa4 dfb79f18 808883a4 808876fc ecac8b10 84430040 9f20: 00000000 00000000 81a50110 81a4ffe0 dfb79f54 dfb79f40 8026b438 8029ce24 9f40: dfb79fb0 40000000 dfb79f84 dfb79f58 802229dc 8026b3f4 00000000 8281d05c 9f60: dfb79fb0 0014c490 ecac8b10 80222930 00000000 e621fe64 dfb79fac 00000000 9f80: 00000000 002e630c 000001aa 8020029c 84520000 000001aa 00000000 dfb79fa8 9fa0: 80200060 80888278 00000000 00000000 00000003 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bf10bc 9fe0: 76bf0ec0 76bf0eb0 0001939c 00131f30 60000010 00000003 00000000 00000000 Call trace: [<8088969c>] (io_ring_buffers_peek) from [<80889e04>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000362 r9:80000001 r8:00000000 r7:85481a0c r6:85481a00 r5:dfb79e14 r4:858f0000 [<80889d9c>] (io_buffers_peek) from [<80893334>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889d9c>] (io_buffers_peek) from [<80893334>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:858f0000 r4:83562500 [<80893080>] (io_recv) from [<80882314>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:84520000 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:858f0000 [<808822c8>] (__io_issue_sqe) from [<80886de4>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:85587600 r7:81cf0b5c r6:0000001b r5:80000001 r4:858f0000 [<80886d9c>] (io_issue_sqe) from [<808878fc>] (io_queue_sqe io_uring/io_uring.c:1963 [inline]) [<80886d9c>] (io_issue_sqe) from [<808878fc>] (io_submit_sqe io_uring/io_uring.c:2219 [inline]) [<80886d9c>] (io_issue_sqe) from [<808878fc>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336) r10:84520000 r9:00000000 r8:00000000 r7:85780000 r6:858f0000 r5:858f006c r4:84430000 [<808876f0>] (io_submit_sqes) from [<808883a4>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline]) [<808876f0>] (io_submit_sqes) from [<808883a4>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330) r10:00000000 r9:84520000 r8:00000000 r7:85587540 r6:00003516 r5:84430000 r4:00000000 [<8088826c>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb79fa8 to 0xdfb79ff0) 9fa0: 00000000 00000000 00000003 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bf10bc 9fe0: 76bf0ec0 76bf0eb0 0001939c 00131f30 r10:000001aa r9:84520000 r8:8020029c r7:000001aa r6:002e630c r5:00000000 r4:00000000 Code: e1a08002 e5912000 e50b2030 e1a05001 (e1d920be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e1a08002 mov r8, r2 4: e5912000 ldr r2, [r1] 8: e50b2030 str r2, [fp, #-48] @ 0xffffffd0 c: e1a05001 mov r5, r1 * 10: e1d920be ldrh r2, [r9, #14] <-- trapping instruction