bisecting fixing commit since db2d0b7c1dde59b93045a6d011f392fb04b276af building syzkaller on 51ca0454d75437183e240f7e23165fe5458908e5 testing commit db2d0b7c1dde59b93045a6d011f392fb04b276af with gcc (GCC) 8.1.0 kernel signature: 47afc179cf873a9d4182cf39857d5d17d9d86445 run #0: crashed: WARNING: refcount bug in cdev_get run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: crashed: WARNING: refcount bug in cdev_get testing current HEAD dc4ba5be1babd3b3ec905751a30df89a5899a7a9 testing commit dc4ba5be1babd3b3ec905751a30df89a5899a7a9 with gcc (GCC) 8.1.0 kernel signature: f70b92645d663a512b5db2aa08bb55d8271239d3 all runs: OK # git bisect start dc4ba5be1babd3b3ec905751a30df89a5899a7a9 db2d0b7c1dde59b93045a6d011f392fb04b276af Bisecting: 1794 revisions left to test after this (roughly 11 steps) [b0c6a78a8a5a8da442c8b42b6f362972b76e3ff9] backlight: lm3639: Unconditionally call led_classdev_unregister testing commit b0c6a78a8a5a8da442c8b42b6f362972b76e3ff9 with gcc (GCC) 8.1.0 kernel signature: a3c65ee6782994358bba7918a9c2e2679e5d6f71 all runs: OK # git bisect bad b0c6a78a8a5a8da442c8b42b6f362972b76e3ff9 Bisecting: 897 revisions left to test after this (roughly 10 steps) [317b6f68abb1f7cfe41b3419b13ad6f8a4cd8492] MIPS: include: Mark __xchg as __always_inline testing commit 317b6f68abb1f7cfe41b3419b13ad6f8a4cd8492 with gcc (GCC) 8.1.0 kernel signature: a7a9a14b5076794ed7e0d4ec91132274b6f81a76 all runs: OK # git bisect bad 317b6f68abb1f7cfe41b3419b13ad6f8a4cd8492 Bisecting: 448 revisions left to test after this (roughly 9 steps) [324b0c9efc772aa94669a7042a17bda3a09eceec] powerpc: dump kernel log before carrying out fadump or kdump testing commit 324b0c9efc772aa94669a7042a17bda3a09eceec with gcc (GCC) 8.1.0 kernel signature: f4b61cae8abd4012c8365e42c449b908c2d79f68 all runs: OK # git bisect bad 324b0c9efc772aa94669a7042a17bda3a09eceec Bisecting: 223 revisions left to test after this (roughly 8 steps) [e841313b5731e5ab82c8d2bac317fac13d78b7eb] firmware: qcom_scm: Use proper types for dma mappings testing commit e841313b5731e5ab82c8d2bac317fac13d78b7eb with gcc (GCC) 8.1.0 kernel signature: cd4e6aa14c01670e322dbb04dfd2035fce0f147c all runs: OK # git bisect bad e841313b5731e5ab82c8d2bac317fac13d78b7eb Bisecting: 111 revisions left to test after this (roughly 7 steps) [a85a0d9f37964b1f721764de6092acc1e19dc466] amd-xgbe: Fix error path in xgbe_mod_init() testing commit a85a0d9f37964b1f721764de6092acc1e19dc466 with gcc (GCC) 8.1.0 kernel signature: d28214b68d1a48359f43659f47f641c0509954c5 all runs: OK # git bisect bad a85a0d9f37964b1f721764de6092acc1e19dc466 Bisecting: 55 revisions left to test after this (roughly 6 steps) [b01b1eb24c04ce95e923843a145bff716eefa2f7] powerpc/mm/radix: Use the right page size for vmemmap mapping testing commit b01b1eb24c04ce95e923843a145bff716eefa2f7 with gcc (GCC) 8.1.0 kernel signature: 6b1e41dc628f600c8170d6617288843762637e88 all runs: OK # git bisect bad b01b1eb24c04ce95e923843a145bff716eefa2f7 Bisecting: 27 revisions left to test after this (roughly 5 steps) [6da56f8982bbe7821f1c41bce0963fa896af7d96] clk: rockchip: Don't yell about bad mmc phases when getting testing commit 6da56f8982bbe7821f1c41bce0963fa896af7d96 with gcc (GCC) 8.1.0 kernel signature: 83d0cacfae113316f444fd0118e8f2a66541777e all runs: OK # git bisect bad 6da56f8982bbe7821f1c41bce0963fa896af7d96 Bisecting: 13 revisions left to test after this (roughly 4 steps) [9a4598424e99feda9c6592230a0d020869f776f1] tipc: add NULL pointer check before calling kfree_rcu testing commit 9a4598424e99feda9c6592230a0d020869f776f1 with gcc (GCC) 8.1.0 kernel signature: da5e7c5dce290009cff30569f272ab578e72e52a all runs: OK # git bisect bad 9a4598424e99feda9c6592230a0d020869f776f1 Bisecting: 6 revisions left to test after this (roughly 3 steps) [821302dd0c51d29269ef73a595bdff294419e2cd] net: gso: Fix skb_segment splat when splitting gso_size mangled skb having linear-headed frag_list testing commit 821302dd0c51d29269ef73a595bdff294419e2cd with gcc (GCC) 8.1.0 kernel signature: c5db904180d99eb92be19bcc05a805c9aac9c94b all runs: OK # git bisect bad 821302dd0c51d29269ef73a595bdff294419e2cd Bisecting: 3 revisions left to test after this (roughly 2 steps) [ea6ec671c87e295eaf3e9ea0aa9b32a674ffc8cf] ipv6: Fix the link time qualifier of 'ping_v6_proc_exit_net()' testing commit ea6ec671c87e295eaf3e9ea0aa9b32a674ffc8cf with gcc (GCC) 8.1.0 kernel signature: 883b849099cdae395326b14ffbe0e36f44d407e9 all runs: OK # git bisect bad ea6ec671c87e295eaf3e9ea0aa9b32a674ffc8cf Bisecting: 0 revisions left to test after this (roughly 1 step) [a20c8e4ae48dd2fba58fce042c2b8653116419df] cdc_ether: fix rndis support for Mediatek based smartphones testing commit a20c8e4ae48dd2fba58fce042c2b8653116419df with gcc (GCC) 8.1.0 kernel signature: 2f847b2e63442d7b435056842e64ca041dfceaa2 all runs: OK # git bisect bad a20c8e4ae48dd2fba58fce042c2b8653116419df Bisecting: 0 revisions left to test after this (roughly 0 steps) [f57fd58dda426cdebe36a1dae169b1c87b2ad295] bridge/mdb: remove wrong use of NLM_F_MULTI testing commit f57fd58dda426cdebe36a1dae169b1c87b2ad295 with gcc (GCC) 8.1.0 kernel signature: f964f62865bed93df23e67d365963518f5b7f4a9 all runs: OK # git bisect bad f57fd58dda426cdebe36a1dae169b1c87b2ad295 f57fd58dda426cdebe36a1dae169b1c87b2ad295 is the first bad commit commit f57fd58dda426cdebe36a1dae169b1c87b2ad295 Author: Nicolas Dichtel Date: Fri Sep 6 11:47:02 2019 +0200 bridge/mdb: remove wrong use of NLM_F_MULTI [ Upstream commit 94a72b3f024fc7e9ab640897a1e38583a470659d ] NLM_F_MULTI must be used only when a NLMSG_DONE message is sent at the end. In fact, NLMSG_DONE is sent only at the end of a dump. Libraries like libnl will wait forever for NLMSG_DONE. Fixes: 949f1e39a617 ("bridge: mdb: notify on router port add and del") CC: Nikolay Aleksandrov Signed-off-by: Nicolas Dichtel Acked-by: Nikolay Aleksandrov Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman net/bridge/br_mdb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) culprit signature: f964f62865bed93df23e67d365963518f5b7f4a9 parent signature: 47afc179cf873a9d4182cf39857d5d17d9d86445 revisions tested: 14, total time: 4h43m3.516054544s (build: 2h4m47.262958956s, test: 2h36m33.605950334s) first good commit: f57fd58dda426cdebe36a1dae169b1c87b2ad295 bridge/mdb: remove wrong use of NLM_F_MULTI cc: ["davem@davemloft.net" "gregkh@linuxfoundation.org" "nicolas.dichtel@6wind.com" "nikolay@cumulusnetworks.com"]