bisecting fixing commit since 7fef2edf7cc753b51f7ccc74993971b0a9c81eca building syzkaller on f415556d566aa67761414184f49b919c0869ed52 testing commit 7fef2edf7cc753b51f7ccc74993971b0a9c81eca compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: 80c91d4f98bb0ed03132c60a1e13e999fce4200a13b1258b18281dbd6d0aa6d6 run #0: basic kernel testing failed: possible deadlock in fs_reclaim_acquire run #1: basic kernel testing failed: BUG: sleeping function called from invalid context in stack_depot_save run #2: basic kernel testing failed: BUG: sleeping function called from invalid context in stack_depot_save run #3: basic kernel testing failed: possible deadlock in fs_reclaim_acquire run #4: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #5: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #6: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #7: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #8: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #9: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #10: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #11: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #12: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #13: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #14: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #15: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #16: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #17: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #18: crashed: KASAN: use-after-free Read in si470x_int_in_callback run #19: crashed: KASAN: use-after-free Read in si470x_int_in_callback testing current HEAD 0aa78d17099b04fd9d36fe338af48ad6fe2d7fca testing commit 0aa78d17099b04fd9d36fe338af48ad6fe2d7fca compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.1 kernel signature: c87e937b12273bb9570228f777e792ede6947fa5fc69a8ad45d389cc498d8928 all runs: crashed: KASAN: use-after-free Read in si470x_int_in_callback revisions tested: 2, total time: 24m41.162886667s (build: 17m14.385018512s, test: 6m56.849302155s) the crash still happens on HEAD commit msg: Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi crash: KASAN: use-after-free Read in si470x_int_in_callback radio-si470x 5-1:0.0: non-zero urb status (-71) ================================================================== BUG: KASAN: use-after-free in si470x_int_in_callback.cold+0xfe/0x11f drivers/media/radio/si470x/radio-si470x-usb.c:378 Read of size 8 at addr ffff888035fd0b40 by task syz-executor.1/10291 CPU: 1 PID: 10291 Comm: syz-executor.1 Not tainted 5.14.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 si470x_int_in_callback.cold+0xfe/0x11f drivers/media/radio/si470x/radio-si470x-usb.c:378 __usb_hcd_giveback_urb+0x238/0x3f0 drivers/usb/core/hcd.c:1656 dummy_timer+0xeb8/0x2eb0 drivers/usb/gadget/udc/dummy_hcd.c:1987 call_timer_fn+0x163/0x4a0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x524/0x890 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0x9c/0x190 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:kmap_local_sched_in kernel/sched/core.c:4461 [inline] RIP: 0010:finish_task_switch.isra.0+0x23c/0xa10 kernel/sched/core.c:4563 Code: 8b 3a 4c 89 e7 48 c7 02 00 00 00 00 ff d1 4d 85 ff 75 bf 4c 89 e7 e8 d3 f1 1a 07 e8 3e a9 27 00 fb 65 48 8b 1c 25 00 f0 01 00 <48> 8d bb 48 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc9000b6f7ef0 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff88803522a200 RCX: 1ffffffff18f91e1 RDX: 0000000000000000 RSI: ffffffff88cb1920 RDI: ffffffff891f5d80 RBP: ffffc9000b6f7f30 R08: 0000000000000001 R09: 0000000000000001 R10: ffffed10173ea368 R11: 0000000000000001 R12: ffff8880b9f51b40 R13: ffff888023758080 R14: 0000000000000000 R15: ffff8880b9f51b58 schedule_tail+0x7/0xd0 kernel/sched/core.c:4617 ret_from_fork+0x8/0x30 arch/x86/entry/entry_64.S:280 Allocated by task 45: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x98/0xc0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x1e4/0x480 mm/slab.c:3575 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] si470x_usb_driver_probe+0x4a/0xf70 drivers/media/radio/si470x/radio-si470x-usb.c:573 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1b9/0xb70 drivers/base/dd.c:595 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:747 driver_probe_device+0x44/0x110 drivers/base/dd.c:777 __device_attach_driver+0x185/0x250 drivers/base/dd.c:894 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:965 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0xa2f/0x1e00 drivers/base/core.c:3354 usb_set_configuration+0xc1d/0x1710 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1b9/0xb70 drivers/base/dd.c:595 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:747 driver_probe_device+0x44/0x110 drivers/base/dd.c:777 __device_attach_driver+0x185/0x250 drivers/base/dd.c:894 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:965 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0xa2f/0x1e00 drivers/base/core.c:3354 usb_new_device.cold+0x5cf/0xedf drivers/usb/core/hub.c:2563 hub_port_connect drivers/usb/core/hub.c:5348 [inline] hub_port_connect_change drivers/usb/core/hub.c:5488 [inline] port_event drivers/usb/core/hub.c:5634 [inline] hub_event+0x10a3/0x36c0 drivers/usb/core/hub.c:5716 process_one_work+0x84c/0x13d0 kernel/workqueue.c:2276 worker_thread+0x598/0x1040 kernel/workqueue.c:2422 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 45: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xcd/0x100 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] __cache_free mm/slab.c:3445 [inline] kfree+0x106/0x2c0 mm/slab.c:3803 si470x_usb_driver_probe+0xa20/0xf70 drivers/media/radio/si470x/radio-si470x-usb.c:766 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1b9/0xb70 drivers/base/dd.c:595 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:747 driver_probe_device+0x44/0x110 drivers/base/dd.c:777 __device_attach_driver+0x185/0x250 drivers/base/dd.c:894 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:965 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0xa2f/0x1e00 drivers/base/core.c:3354 usb_set_configuration+0xc1d/0x1710 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1b9/0xb70 drivers/base/dd.c:595 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:747 driver_probe_device+0x44/0x110 drivers/base/dd.c:777 __device_attach_driver+0x185/0x250 drivers/base/dd.c:894 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:965 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0xa2f/0x1e00 drivers/base/core.c:3354 usb_new_device.cold+0x5cf/0xedf drivers/usb/core/hub.c:2563 hub_port_connect drivers/usb/core/hub.c:5348 [inline] hub_port_connect_change drivers/usb/core/hub.c:5488 [inline] port_event drivers/usb/core/hub.c:5634 [inline] hub_event+0x10a3/0x36c0 drivers/usb/core/hub.c:5716 process_one_work+0x84c/0x13d0 kernel/workqueue.c:2276 worker_thread+0x598/0x1040 kernel/workqueue.c:2422 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888035fd0000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2880 bytes inside of 4096-byte region [ffff888035fd0000, ffff888035fd1000) The buggy address belongs to the page: page:ffffea0000d7f400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x35fd0 head:ffffea0000d7f400 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000cea888 ffffea00007f8e88 ffff88800fc40900 raw: 0000000000000000 ffff888035fd0000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 45, ts 71759282134, free_ts 71677494277 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0xa6f/0x2f50 mm/page_alloc.c:4169 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x460 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3316 [inline] kmem_cache_alloc_trace+0x38c/0x480 mm/slab.c:3573 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] si470x_usb_driver_probe+0x4a/0xf70 drivers/media/radio/si470x/radio-si470x-usb.c:573 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1b9/0xb70 drivers/base/dd.c:595 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:747 driver_probe_device+0x44/0x110 drivers/base/dd.c:777 __device_attach_driver+0x185/0x250 drivers/base/dd.c:894 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:965 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0xa2f/0x1e00 drivers/base/core.c:3354 usb_set_configuration+0xc1d/0x1710 drivers/usb/core/message.c:2170 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3411 slab_destroy mm/slab.c:1627 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1647 cache_flusharray mm/slab.c:3418 [inline] ___cache_free+0x4c6/0x610 mm/slab.c:3480 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x4e/0x110 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x8b/0xa0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slab.c:3261 [inline] kmem_cache_alloc_node+0x2cc/0x580 mm/slab.c:3599 __alloc_skb+0x153/0x280 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1112 [inline] alloc_skb_with_frags+0x73/0x540 net/core/skbuff.c:6019 sock_alloc_send_pskb+0x622/0x7b0 net/core/sock.c:2461 mld_newpack+0x1d5/0x840 net/ipv6/mcast.c:1751 add_grhead+0x243/0x320 net/ipv6/mcast.c:1854 add_grec+0xc49/0xff0 net/ipv6/mcast.c:1992 mld_send_initial_cr.part.0+0xbb/0x180 net/ipv6/mcast.c:2239 mld_send_initial_cr net/ipv6/mcast.c:1227 [inline] mld_dad_work+0x177/0x510 net/ipv6/mcast.c:2265 Memory state around the buggy address: ffff888035fd0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888035fd0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888035fd0b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888035fd0b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888035fd0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 8b 3a mov (%rdx),%edi 2: 4c 89 e7 mov %r12,%rdi 5: 48 c7 02 00 00 00 00 movq $0x0,(%rdx) c: ff d1 callq *%rcx e: 4d 85 ff test %r15,%r15 11: 75 bf jne 0xffffffd2 13: 4c 89 e7 mov %r12,%rdi 16: e8 d3 f1 1a 07 callq 0x71af1ee 1b: e8 3e a9 27 00 callq 0x27a95e 20: fb sti 21: 65 48 8b 1c 25 00 f0 mov %gs:0x1f000,%rbx 28: 01 00 2a: 48 8d bb 48 15 00 00 lea 0x1548(%rbx),%rdi <-- trapping instruction 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 48 89 fa mov %rdi,%rdx 3e: 48 rex.W 3f: c1 .byte 0xc1