8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=85893003, *pmd=eb7c1003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6400 Comm: syz.0.641 Not tainted 6.15.0-rc5-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 : [<8088956c>] lr : [<80889cb0>] psr: 20000013 sp : dfa09dc0 ip : dfa09e08 fp : dfa09e04 r10: 00000362 r9 : 00000000 r8 : 853d8bc0 r7 : 853cb90c r6 : 853cb900 r5 : dfa09e44 r4 : 85772240 r3 : 00000001 r2 : 853cb90c r1 : dfa09e44 r0 : 85772240 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8573f7c0 DAC: 00000000 Register r0 information: slab io_kiocb start 85772240 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfa08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 853cb900 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85772240 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfa08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 853cb900 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 853cb900 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 853d8bc0 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 0xdfa08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfa08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.0.641 (pid: 6400, stack limit = 0xdfa08000) Stack: (0xdfa09dc0 to 0xdfa0a000) 9dc0: 853d8bc0 00000001 85772240 dfa09e44 853cb900 853cb90c 00000000 85772240 9de0: dfa09e44 853cb900 853cb90c 00000000 80000001 00000362 dfa09e1c dfa09e08 9e00: 80889cb0 80889554 84ca1180 85772240 dfa09e84 dfa09e20 808931e0 80889c54 9e20: 80892f2c 20000013 dfa09ebc dfa09e38 00010001 00000001 85772240 00000000 9e40: 00000000 853cb90c 00000000 00000000 00010001 5ea9c0e3 81cf0b5c 85772240 9e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 8330b000 dfa09ebc dfa09e88 9e80: 80886bd8 80892f38 85772240 858a0000 0000001b 855b6800 857722ac 85772240 9ea0: 858a0000 00000000 00000000 8330b000 dfa09f14 dfa09ec0 808877a8 80886b7c 9ec0: 8088e164 81a4bdd8 849b0540 855ebc00 00000800 00000800 81cf0b5c 00000800 9ee0: 855b6800 5ea9c0e3 849b0540 00000000 855b6800 00003516 849b0540 00000000 9f00: 8330b000 00000000 dfa09fa4 dfa09f18 80888250 808875a8 8330b000 855b6840 9f20: 00000000 00000000 8330b000 000001aa dfa09f54 dfa09f40 81a53ac8 8029ce1c 9f40: 80888118 80000013 00000000 dfa09f58 80200c04 81a53a88 00000005 00003516 9f60: 00000000 00000000 00000000 00000000 002e630c 5ea9c0e3 8020029c 00000000 9f80: 00000000 002e630c 000001aa 8020029c 8330b000 000001aa 00000000 dfa09fa8 9fa0: 80200060 80888124 00000000 00000000 00000005 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b9b0bc 9fe0: 76b9aec0 76b9aeb0 0001939c 00131f30 60000010 00000005 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889cb0>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000362 r9:80000001 r8:00000000 r7:853cb90c r6:853cb900 r5:dfa09e44 r4:85772240 [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889c48>] (io_buffers_peek) from [<808931e0>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:85772240 r4:84ca1180 [<80892f2c>] (io_recv) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<80892f2c>] (io_recv) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:8330b000 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0 r4:85772240 [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_queue_sqe io_uring/io_uring.c:1975 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqe io_uring/io_uring.c:2231 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348) r10:8330b000 r9:00000000 r8:00000000 r7:858a0000 r6:85772240 r5:857722ac r4:855b6800 [<8088759c>] (io_submit_sqes) from [<80888250>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline]) [<8088759c>] (io_submit_sqes) from [<80888250>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342) r10:00000000 r9:8330b000 r8:00000000 r7:849b0540 r6:00003516 r5:855b6800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa09fa8 to 0xdfa09ff0) 9fa0: 00000000 00000000 00000005 00003516 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b9b0bc 9fe0: 76b9aec0 76b9aeb0 0001939c 00131f30 r10:000001aa r9:8330b000 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